Dicks sporting goods, 3 Hockey pucks. Pretty half-a$$ but itll get the job done.
hockey pucks will break down fast. cheap option but you'll be constantly inspecting them & replacing. check BFI (blackforestindustries), they have kits starting at $145 & single mounts. Fourseasontuning carries them but with free shipping. Or just go to a machine shop.
longer hardware- just add the thickness to the length of the stock bolt, go to a decent hardware store & get it in grade 8 or higher.
Preventative Maintenance is like tying your shoe laces... fools be trippin'