Integy RC Model Hop-ups T3845PURPLE MSR4 Piggyback Shock for Maxx 3903,3905,3906,3908,4907,4908,4909,4910(L=108mm) Genuine Integy Parts Ship Fast Direct From Our US Warehouse Top-Quality Materials & Superb Craftsmanship Preferred by Knowledgable Model Hobbists & R/C Enthusiasts Most Orders Processed Same Day. Reliable & Fast Shipping With Tracking Number Check The Manufacturer's Support Website For Cross-Reference Part Search