Did you alread raise the topdeck with the 2mm spacers that TM has in the kit for that reason.

Batteries that I know for the stock plastic tray. SMC 3200 and 4100 lipos fir perfect. I use the 4100 24C this weekend in 17.5 and ran fast lap in 2 of 3 rounds. I would of TQed except for a few driving mistakes.

The Orion Platinum 4800 and 5000 packs fit perfect, as do the 3800, 3600 and 3200 Orions. Tracpower 3600 fit perfect as will the Triity IP3800's.

I know all these fit with the stock tray as I had everyone in my car to test the fit.

If you order the WOlf Hobbies steel lipo tray then let me know. Then I know all the Orions I mentioned fit and so will the IP3800. The SMC packs are more square and will need slight modifications to fit the Wolf lipo tray.