I use the SX3 wing mounts on my Procat but you can still get the old wing rubbers. Just look for a the size on eBay they are cheep the same goes for the o rings on the front.
Here's mine
http://www.oople.com/forums/showthre...=148624&page=4
And as for the belt tension I've never had a problem with setting it to the manual setting. You'll get the hand of it eventually, and i run mine with a 6.5t brushless setup and I've had no problems yet.
http://www.retromodelisme.com/scan_p...r-page-11.html