When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Mojo Customs sell weld-on motor mounts that will allow you to customize your stretch and offset the engine for a 8inch fatty rear wheel.
You can get a shock mount from there also. https://mojo-customs.com/product/gy6-weld-on-mount/
If you're making your own mount, here's where most people weld them on: