Project Willy's Wheeler: this is the top of the rear fuel cell provided in the same dimensions as that found on the M38. It is compatible with
Wheeler - fuel cell (P7V5QTD8E) by Nicherotors (shapeways.com) and offered as a separate part to ease with painting and ideally printed in more detail.
This item is part of an overall project to enhance Willy's Wheeler; further information about the project can be found here:
NicheRotors :: Original Wild Willy Custom Parts - Page 4 - TC Designs... - Tamiyaclub.com