Fits fine with 10mm washers for spacers to make up for the difference in thickness from stock. I held the washers together with scotch tape when installing to make life easier, probably better ways to do it but it works. It rides just fine with an adult female passenger, rough combined weight around 320lbs and reasonably handles bumps. Also lowered the front forks about 1.5" when initially putting it together.
https://www.amazon.com/ZXTDR-Suspens...6774134&sr=8-1
ZXTDR 290mm 11.42" Rear Shock Absorber Suspension Sensa-Trac Load Adjusting for Dirt Pit Bike Motorcycle 1200LBS
No need to cut the seat foam. Leave it. Its comfortable.
You will need to cut a bit off the kickstand to make it shorter too.
See picture of what it looks like lowered.
https://postimg.cc/G8rq21kh