1991 Accord eh?
Heres the break down...
1991 Accord DX = F22a1
1991 Accord LX = F22a1
1991 Accord EX = F22a4
1991 Accord SE = F22a6
And yes, it is a noob question.
You can also see for yourself which one you have.
Its right next to the Altenator, stamped right on the Block...
The Green circle Suppose to show where it would on the Engine Block
It should read something like this...If you notice its right under the rubber
boot. Thats like a Tranny/Flywheel cover...