Looks like the m2c racing motor plate and chassis brace is now available (yeah, the link is weird):
https://m2cracing.net/arrma/583-m2c-3160-arrma-17mm-hub-extenders.html
To be honest, $70 is a little pricier than I thought they would be - but if they work...
https://m2cracing.net/arrma/583-m2c-3160-arrma-17mm-hub-extenders.html
To be honest, $70 is a little pricier than I thought they would be - but if they work...