ferrea valve selection

i was lookin on the ferrea website looking for the part # of the valves that i need for my 1995 LS (b18b1) and am not sure which one i need. since i'm just replacing the stock valves i narrowed it down to two possibilites. look @ this link

http://www.ferrea.com/ferreacgi/webd...c tion=Search

and let me know which valves i'd need to replace my stock valves. i am assuming that its either part # f1816p and # f1815p. thanks