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You should be able to find those bolts in the Help section at any decent parts store(Bumper to Bumper in my case.) IIRC the ones we picked up for my buddy's 86 were packaged as being for a GM, but they were the right ones.
My friend at the parts store said the sam thing... "help" might have the bolts.
I used a regular bolt on my '78 at one point in time, but ended up getting the right bolts off a parts truck later - of course it could be a totally different bolt/driveshaft set up.
Definitely go to a Hardware store or a Fastener Distributor store. I needed the 12 Bolts that fasten the Exhaust Manifolds to the Heads on my 88 BII. Called the <NOBR style="COLOR: darkgreen; FONT-SIZE: 100%; FONT-WEIGHT: normal" id=itxt_nobr_5_0>Ford</NOBR> Place. $236.00!!! Luckily, i was really nice to the parts lady and she gave me the Size and Exact Lengths (3 different). I called a Fastener Store bout 60 miles away(i live in the sticks) told them what i needed. Guy told me $9.32. Told him i'd be there in bout an hour! Same exact Bolts! I do believe in shopping around especially when somebody starts talking big bucks.
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That's what I would believe the bolt should look like... all the parts/hardware stores around here don't stock a bolt like that.. it's nice to have a pict of what it looks like... thanxs!
I did the same thing you are doing when I needed mine. I called up Bronco Graveyard to ask them if they had them, and the guy told me they aren't any fancy, special bolt (like I was under the impression they were). He said that I could just use normal bolts. They don't have to have that 12 point head on them.