Ted (fox flier) is a member of the Yahoo group listed below. Perhaps he will answer your inquiries as he is fairly active there. If not, there is such a wide knowledge base there that other members may assist you.

http://groups.yahoo.com/group/M5Stuartrctankbattalion/

For informational purposes I've listed other sites for M5 upgrades, including the Foxflier site:

http://www.customrcmodels.com/M5Stuart/index.htm

http://www.foxflier.com/stuart/index.htm

http://geocities.com/patsmodels/stuart/


Hope this helps,
-Harq