i'm looking to convert my cloth stock honda seats out of my 98 civic ex coupe. i want to get leather ones? could i use 1999 or 2000 si leather seats? front and rear!. also whatother year hondas with black leather seats would fit in my 98 coupe. i want front and rear seating!

 

the 99-00 Si front seats will definitely fit, and I think the rear seats will most likely fit.

I can't really think of any other black leather honda seats, although i'm sure there are more.
I think there's some leather GSR seats, the front seats of those will fit.

For the rear seats I think you'll either have to get the 99-00 Si rear seats or some custom leather upholstery to have leather in the backseat.