ESC FOR CAT SX

[Verde]

I've recently bought a used SX and have a Novak 5.5t sensored motor. Can anyone recommend a reasonably priced sensored esc that will fit as the Cat seems very tight on space. I've been looking for a used Novak GTB, but also considering Castle, Hobbywing and worried they won't fit.

Also, what size batteries should I buy? (it's the lipo version). The hard case Plazma's from my B4.1 don't fit an they're only 3000/20's.

Many thanks.