I notice in my Felpro engine gasket kit includes something called a 'retainer bolt spacer sleeve'. I'm guessing they must have had some reason for including it, but I'm at a loss. BTW I'm working on a 75 or 76 engine (/6 of course).

I noticed the same thing recently, my kit had a little sheet on rear main seal installation that mentioned the retainers but they weren't in my kit.

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225 .030
.020 off the block .100 from head
Comp 264
904 Tranny
New Ebre-ting

http://s78.photobucket.com/albums/j103/edrod01/

Thanks 65 Deuce,
That reinforces my suspicion that these (inch long plastic tubes) probably go in the bolt holes in the rear main retainer. I guess I left the old ones in place when I changed the rear main seal. Hope that works out. I just buttoned up the oil pan and timing cover ahead of the noreaster. Might delay the swap if we get any accumulation.

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/6 '67 Barracuda convertible, electronic ignition, 4-OD, street cam, SBP KH discs, 3.55 SG 7.25" 1" t-bars. Bilstein.
340 '67 fastback, Doug Nash 5-speed.
1988 Toyota pickup work truck

I have a new felpro set I am saving for a rebuild. I noticed those things too and had the same response. Good point to be aware of. I'll check the factory manual when I get a chance and see if they show them in there as well.