1957/63 and 1964/72 truck parts catalogs show the T-86 with a removable cover on top.

1964/72 truck parts catalog pic shows the T-85 with a removable cover on top.

I listed the part numbers for both of the covers in my previous post...they are different numbers.

I don't have a T-86 around here to look at, but I do have a T-85...as my 1965 F100 has one. It's been in there since the truck was new.

And I know it's original...because I bought the truck new.

One of the pics you posted has T-87 marked on it.

T-87's are a H/D 3 speed manual that were not offered in F100's (F250/350's and P Series Parcel Delivery's only). T-87's were not available with overdrive.

Regardless, a T-85 will NOT fit a 223 engine...no ifs, ands or buts!
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215 & 223 I-6 engines are totally different than 240/300's.

For one thing...

215/223's have the intake/exhaust manifolds mounted on the drivers side of the block.

These parts are on the passenger side on 240/300's.

240/300's used the T-85N overdrive, they were not available with T-86's.

From the VIN engine code (4th digit: J), that 1965 F100 on ebay has a 240.

J was used in 1965 only for 240's. A was used from 1966 thru 1974 for 240's.

J was also used thru 1964 for 223's.