I would assume the T/A hoods would use the same spring as the AAR hood both are fiberglass. I know the AAR`s came with lighter springs.I put a repro AAR hood on my Barracuda the springs that I ordered for it were awful they came from Penstar. Spring tension was way too tight and the springs had a bright shine to them almost like chrome nearly bowed the hood closing it just like an original. I would avoid them.
There are original type springs for sale out there around $50-$60 bucks if I remember correctly. However if originality is not a concern you can buy trampoline springs here
http://www.nexternal.com/shared/Sto...reType=BtoC&Count1=374599635&Count2=291740059 I had a couple extra from my kids trampoline so I didn`t have to buy any
they work great, and for $17.00 you get 5 of them.The 5.5 inch spring holds my hood up no problem and it closes nice and easy.
Just to be clear everything I mentioned here is for Barracuda hinges i`m no expert on Challenger stuff you may need a different hinge than the 5.5 inch one I used.