Radiator support cage nuts?
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Laughing Gas
Joined: Oct 2007
Posts: 773
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Radiator support cage nuts?
Does anyone know where I can find the special rectangular cage nuts/clips that go in the bottom of the radiator support? It takes five of them. They look a little different from your average square cage nut.
Lead Gopher
Joined: Aug 2012
Posts: 10,049
Likes: 1,603
From: Seattle
Do you think they look something sort of like these? These are also used on the floor of my 4x4 trucks for the plate that covers the transmission area. My 2x4 truck is an automatic so no removeable cover there, but I do believe these are the same clips.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
C1TZ-16B166-G (replaced C1TB-16B166-A & C & E; C1TZ-16B166-E) .. Cage Nut - 1/2" -20 x 1/2" thick / Obsolete
1961/65 F100/250 4WD / 1961/66 F350/600 / 1965/66 F100/250 2WD / 1966 F250 4WD
No Ford dealer or obsolete parts vendor has any.
C1TZ-16B166-E =
MILLER OBSOLETE PARTS in Binghamton NY has 4 = 607-722-5371.
Shown as 16B166 in pic:
1961/65 F100/250 4WD / 1961/66 F350/600 / 1965/66 F100/250 2WD / 1966 F250 4WD
No Ford dealer or obsolete parts vendor has any.
C1TZ-16B166-E =
MILLER OBSOLETE PARTS in Binghamton NY has 4 = 607-722-5371.
Shown as 16B166 in pic:
Lead Gopher
Joined: Aug 2012
Posts: 10,049
Likes: 1,603
From: Seattle
C1TZ-16B166-G (replaced C1TB-16B166-A & C & E; C1TZ-16B166-E) .. Cage Nut - 1/2" -20 x 1/2" thick / Obsolete
1961/65 F100/250 4WD / 1961/66 F350/600 / 1965/66 F100/250 2WD / 1966 F250 4WD
No Ford dealer or obsolete parts vendor has any.
C1TZ-16B166-E =
MILLER OBSOLETE PARTS in Binghamton NY has 4 = 607-722-5371.
Shown as 16B166 in pic:
1961/65 F100/250 4WD / 1961/66 F350/600 / 1965/66 F100/250 2WD / 1966 F250 4WD
No Ford dealer or obsolete parts vendor has any.
C1TZ-16B166-E =
MILLER OBSOLETE PARTS in Binghamton NY has 4 = 607-722-5371.
Shown as 16B166 in pic:
.
Lead Gopher
Joined: Aug 2012
Posts: 10,049
Likes: 1,603
From: Seattle
Look to Illustration Section 82 - Page 2 and that will hone in on the part number. Used in a few places.
359218-S2
NOS sources I know of are completely dry as far as this part goes.
But, they are close to this I believe.
https://www.amkproducts.com/bulk3.asp?part=B-12035
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Lead Gopher
Joined: Aug 2012
Posts: 10,049
Likes: 1,603
From: Seattle
It also looks like NPD would normally carry this but is out of stock right now.
https://www.npdlink.com/store/produc...-167544-0.html
The cage just snaps into the opening and the wings are on the backside to keep the nut from pulling through.
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https://www.npdlink.com/store/produc...-167544-0.html
The cage just snaps into the opening and the wings are on the backside to keep the nut from pulling through.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
rearcounter & PartsVoice: CARPENTER NOS OBSOLETE PARTS in Concord NC has 2 = 800-476-9653.
On rearcounter, DC's description is cage BOLT.
Lead Gopher
Joined: Aug 2012
Posts: 10,049
Likes: 1,603
From: Seattle
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Lead Gopher
Joined: Aug 2012
Posts: 10,049
Likes: 1,603
From: Seattle
I researched a bit further and these should be exact duplicates. They are listed on the official book of fasteners right next to one another.
5/16-24 1.06" OAL .78" Width - 359218-S2
5/16-24 1.06" OAL .78" Width - 377998-S2
https://www.amkproducts.com/bulk3.asp?part=B-12035
It at least gives you a reference to check sizes at other vendors.
5/16-24 1.06" OAL .78" Width - 359218-S2
5/16-24 1.06" OAL .78" Width - 377998-S2
https://www.amkproducts.com/bulk3.asp?part=B-12035
It at least gives you a reference to check sizes at other vendors.
Last edited by TA455HO; Feb 8, 2026 at 10:28 AM.
Lead Gopher
Joined: Aug 2012
Posts: 10,049
Likes: 1,603
From: Seattle
Ya, AMK Products has a minimum $30 order, too. Check around and you might be able to get them cheaper. The NOS ones I got some time ago were $1 a piece.
Last edited by TA455HO; Feb 8, 2026 at 10:29 AM.