The buggy you pictured is NOT a Hyper 7, nor any kyosho buggy. In fact, it's an Ofna MBX R2. I have the exact same buggy. I couldn't find any motor plates that fit, so I made my own out of a spare 3.5mm chassis.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy