not quite any .28 pull start, but any of that engine is based on (i.e, XTM is SH based, so SH based engines pullstarts for the .28 should fit)
i do have a losi (SH based) Mach .26, if you can get me the bolt pattern between the pullstart housing screws, i can see if it is the same to double...
Most XTM engines are SH based, they use SH parts. just like Dynamite uses SH based engines and use SH parts. it is the safest bet to get direct fit OE parts, but for an engine long discontinued, that would be more difficult and price consumptive than finding another companies badged same part...