This is the larger of the two replacement SH Pullstarts available, which features a 32mm hole spacing designed for use with the Big Block SH engines, which include some of the .21 engine's and almost all of the .28 engines.
Being as SH make many other engine OEM for other companies, it will also fit engines such as;
LRP Z28R (Spec 1/2/3)
XTM SH .28 (Fitted as standard in the XTM Mammoth & XTM XLB)
If you require any further help with regards to the fitment required, don't hesitate in getting in touch with us.