Hi Chris,here's were I got the mid drive.Not to many places here that carry the mid drive,lots places have the hub,had one of those on my last EBIKE but not again. One flat tire on the rear and a few broken spokes.No one wanted to touch the bike.Proved out to be very difficult to get help with it.
Address as follows
Power in Motion
Eua Claire Market
176-200 Barclay Parade SW
JT2P - 4R5
A Bafang 750watt 48 volt 17 amp
Tried to copy page over here with my phone - no luck.
Between their site and the Watt Wagons forum here make sure you read about increased efficiency, smoothed out function and control, expanded ability to self program later. Increased power may be the least of it.