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any questions for gpm racing please check with our highly trained team. GPM neu gestaltet 7075 ALU Adj Motor Mount für Traxxas 1/8 Maxx Slash 1/10 Maxx (TS1838) original part no:8960+8987part location:motor area, main gear area major advantages of upgrading to this part/product:(1) 7075 alloy material, redesigned the motor mount can be adjustable , fits well with original motor or bigger size motor such as "4985"(2) works for below gear option:46 /27, 50/23, 50/24, 50/25, 52/21, 52/22, 52/23, 52/24, 54/19, 54/20, 54/21 adjustable:how: insert the stabilizing pin on different positioning holes on the bottom mount..