Pete told me about these - they are conversions which put the motor at the very front of the chassis - just like a TA-03F.
Pictures say it all.
Here's the link Pete sent me - TA-05 / VDF conversion:http://driftmission.com/rc-mania-front-motor-conversion-kit/
Here's one I found - some Japanese dude's blog. Conversion for a Max Speed Technology MS-01D. This one is nice cause it uses 2 belts - not 3 like the TA-05 / VDF conversion:http://rcdrifttt01.blog34.fc2.com/blog-entry-1384.html
Conversion for Street Jam OTA-R31:http://driftmission.com/r31-chassis-front-motor-conversion-kit/
If you find more of these conversions please post them here. I'm hoping someone in NZ will get one of these (or even better, make one) cause I reckon these are super cool.