I donīt really understand why they didīnt make the outer pieces u-shaped? Then they could have used the battery post holes in the chassi instead. Would have saved 2 spacers.
It would also have fitted the 501X as well. (Not so important for Tamiya maybe, the 501X is discontinued)
You would also be able to remove the undercowl without touching the tray.
No, thatīs not a big problem. But one more thing that you have to remember each time you have removed the undercowl. Two more things on the pit table each time you remove the undercowl.
My 501X tray fits the 511. BUT you have remove some material from the center bulkhead. The battery will be in "standard" position.
On the 501X you donīt have this problem. The LiPos fit without any modification of the bulkhead.
My 511 tray do not fit the 501X. The rear mounting hole (where you attach the 511 undercowl) does not exist on the 501X. The rear (front) suspension mount is also different between 501X and 511.
This is why I donīt think the Tamiya tray fits the 501X. Maybe you can modify it to fit.
The 511 LiPo tray moves the LiPos back to clear the bulkhead.
Here are pics of the 511 alongside the 501X:
http://www.tamiyaclub.com/showroom_m...87535&id=13377