I Have A 1989 Hatch And I Got 90-91 CRX Si Seats, And I Was Wondering What Rails To Use, Can I Use Any 88-89 Hatch Rails Or Do I Have To Use 89 Si Hatch Rails

 

check out the faq's on here, theres a DIY where you switch the seat pans, pretty easy probably take you an hour for both seats, basically just take the clips off seats that hold on seat pan take off seat pan, and swap.
edit: darn wont work this way. the only way i can think of is take guts out of hatchback seat, then put guts from si crx seat on the hatchback frame, complicated sorry

 

but what if i use 89 Hatch Si Rails, because i thought that any Si Rails bolt up to any year si seat pan, because i was going to find 89 si rails so they will bolt up to my 89 hatch

 

Im pretty sure you need to do a seat pan swap

 

the rear inside mounting points differ between the 88-89 and 90-91.

 

the 90-91 rails are different than the 88-89 so they wont aling were you bolt it in. I also changed just the pan but did not work so i had to replace the the whole thing...