Battery fitting problem, please help !

[Nige55]

I hope someone can help with this. I have an original BJ4 (non worlds) which I love. I've been running lipo, but recently bought NIMH cells because the local track doesn't allow lipo yet.
I got a few packs of the Orion 4200 SHO's, but they seem far too big for the chassis cell slots. It really puzzles me because I can't imagine that thay are SO much bigger than cells a few years ago. The width is fine, but with each cell slot they do this -

0 0 0 0 0 0
- - - - - -

it's the same problem with the hold down strap. I've filed the slots already, I don't think I can file them down any more and still have enough material.

Any ideas / suggestions ?
any info would be really appreciated !
Cheers, - Nige.