Nitro RC Roto or Electric start backplate. Universal fit for most engines but if in doubt please ask.
Insert for 1 x 12mm Hex one way bearing fitting (Bearing not included. See Ebay item number 283850431766 for the correct bearing)
32mm Length (Across Backplate)
32mm High (Across Backplate)
27mm between fixing hole centres. Measured both vertically and horizontally
19mm Depth / Width
The screws supplied will suit many engines. they may need to be cut to size.
From my experience this pull start will fit the following engines. it may also fit others.
VX Engines - .12, .15 and .18
Acme and Infinity engines
Thunder Tiger GP15 and 21Pro
XTM .18 Engine
Tamiya Engine with a Blue cylinder head (not the older silver head versions)
Traxxas TRX 2.5
Ansmann .15 and .21