92-93 rear mud flaps on a 90-91?

this is most likely a really noob question but do 92-93 coupe rear mud flaps fit on a 90-91 coupe? cause my friend gave me his mud flaps off his 92 i think? so when i went to put them on, i noticed that where i go to place the screws in on my car there were no holes? there were only little imprints of wholes that dont fully go threw? am i suppose to drill a whole in it to install it, or am i just way off here and 92-93 arent made to but put on 90-91s? hhahah

does anyone know?

I think you just answered your own question. But, if you really want mud flaps/guards, I think you should just get the ones for your 90-91 rear bumper. I have a set for a 90-91 that I don’t need since I have a 92-93. If you’re interested in buying them, let me know.

sell me the 92-93 mudflaps!