The Team Magic springs are nice, wide range of spring rates and some funky cool colors, Associated springs will fit but they are a little long or tall, especially if using bigger foam or rubber tires, seems most other springs out there will work, the stock ones in the kit are really short, so if compare, maybe find some that are in between those and associated in length. You can also get 3 different piston options from Team Magic, and I belive the bladders are a common metric type size, i.e., HPI and others will fit....