Brake light/turn signal bulbs: 7506
Tail light bulb: 5008
Fuel pump/horn/etc (BMW 61-36-1-393-412) relay can be replaced with NAPA AR614 relay although the NAPA part doesn't have the lugs to lock the relay in place.
Deutsch FF424 fuel filter
I've heard of replacing the fuel pump with a 4cyl Ford Mustang fuel pump (NAPA P74095), but I believe the OD is different and requires some shimming to mount it.
FRAM PH6063 is the correct FRAM but hard to find at WallyWorld.
FRAM PH3614 is readily available and works
AC DELCO PF-53
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