I just recently ordered a set of gearboxes for my Stug III Ausf A conversion. I came across these on ebay...
https://www.ebay.com/itm/Mato-MT197-3-1 ... SwXj5XF7JT
I had not seen the low/ low motor mounts before and thought that I would give them a shot and see what they are like. They are supposed to be here Thursday, so when they come in I'll post a side by side comparison of these and the mid/ low gearboxes that are already in the Pz III.
Bill