Yes, the Hyper ST Pro engine mount is junk.. I stripped out a screw in one and looked and looked for something new.. I found it annoying that like all the Hyper buggies and truggies had different mounts.. In the end I gave up and just got another stock one.. I think you can get a quick change mount for the 8.5 buggy - but I'm pretty sure you'll have to drill new holes in the chassis...