JAILBIRD found these
http://www.teamstrc.com/ebproductdet...mainid=3&id=68
You might get away with sckt hd cap screws if you are still running all plastic parts there, but the finish on them is not meant to be used as a bearing surface. Thread length on them should be around 14mm - so your guess of 40mm was close. Probably function ok though. Use a nylock nut.
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES
