From the Rev 8 thread.
The plastic parts can be ordered here individually:
https://www.shapeways.com/search?q=speedmerchant&type=
The balance of the upgrade kit is part #7050 from SpeedMerchant.
http://teamspeedmerchant.com/shop/pa...l/smr7050.html
Originally Posted by
liljohn1064
They work fine. Plenty strong.