Highway Stars stock GM # 25171792 ACDelco GF652 Fuel Filter for GNX grand national
www.highwaystars.net
Original was GF-481 and you can find them if you want one.
I used the one listed above from highway stars with no issues before converting to E85.
I use wix oil filters but never had or heard of a issue with the AC Delco fuel filters. I think most important is changing them out frequently. I do mine every spring.