When i bought my z it came with an L26 swap and a early 5 speed tranny but now clutch is going bad and i dont know what clutch do i need to use 240z,260z or if i can use a 280z/zx non turbo clutch? please if any one can help!

The clutch is the same for all the non turbo cars and 2+2's. (Turbo cars and 2+2's have a larger diameter). Different manufacturer's make clutches to different specifications for specific needs and applications, but a relatively stock motor doesn't require anything more than a stock type clutch. You can get them at O'rielly's, Ebay, Napa, most anywhere, for around $120 +/-. Get the entire kit, clutch, pressure plate, throw out bearing as a set and you will be fine. Remember to resurface the flywheel or you are likely to be wasting time and money. Do a search for "clutch" and you will find pages of information right here at this site.

Match the bearing collar to the clutch........240z collar to 240z clutch........280z collar to 280z clutch etc.

well thankz for all your help i think now is ebay time to search for a new clutch