is it possible to get door sill covers that do not have that enourmous cutout for the seat belts? i am going to use 4th gen belts, which do not have a lower retractor, so i do not need that huge cutout.

 

I have not seen any.

 

here in southern california we have tons of junkyards with plenty of thirdgens, and what i've found is some of the earlier cars (82-84?, not sure) have door sills with exactly what you're talking about: smaller openings for seatbelts with only one retractor (mounted on the roof). I'm not sure if they're readily available where you are, but those doorsills for thirdgens were made from the factory, and you can maybe search for them on ebay or something... hope this helps.

oh, btw... '85 L69 t-5... pretty rare combo and very cool.