Do what ya got to do, but just in case you change your mind here are a couple links to what you may need.
reverse gearbox, anti rotation bracket and shifter...
http://www.ebay.com/itm/160685045018...ht_3137wt_1163
Two different cable sizes...
http://www.ebay.com/itm/Reverse-Gear...#ht_967wt_1163
http://www.ebay.com/itm/78-Reverse-C...ht_3102wt_1163
Shaft...
this one does not have the length... it has to be about 8"
http://www.ebay.com/itm/150cc-GY6-DR...#ht_991wt_1163
http://www.ebay.com/itm/Outer-Shaft-...ht_4024wt_1163
That's pretty much it... I think I should post this somewhere else because we have hi-jacked this thread