RPM Caster Blocks for the Traxxas Slash 2wd, nitro Slash, electric Rustler & electric Stampede 2wd are the final link for a complete, bulletproof front suspension. RPM Caster Blocks are redesigned to slim down unnecessary bulk while improving strength and durability in this heavily impacted area. No additional parts or modifications are necessary to mount a set to a vehicle.RPM Caster Blocks are molded in a trademark blend of ultra durable and super strong nylons and backed by the best breakage warranty in the R/C industry. Each package contains one left side and one right side caster block.Tech Notes: RPM #80715 Caster Blocks replace Traxxas stock #3632 Caster Blocks. RPM Caster Blocks retain stock Rustler & Stampede 30 degree caster settings. These Caster Blocks will not work on nitro versions of the Rustler & Stampede nor 4wd versions of the Stampede or Slash.