Aluminium undercarriages are all very well but they bend, and once bent they are never the same. Replacing the original with a carbon fibre replacement is the way forward. Lighter and stronger the Carbon RC Parts XL50 undercarriage is a suitable replacement for the Acrowot XL 

A=160

B=426

C=170

D=35

Measurement D is a little narrower than the original as it does not need to be as wide.

This unit is supplied in one piece, and is undrilled.