Hi fellow pilots i need your wise wisdom and knowledge once again
Ive just upgraded to a nitro heli which i swapped for one of my electric helis ive got myself a hirobo shuttle with everything,

problem is i need to replace the engine as the one in it has blown i could repair it, as all it needs is a connecting rod and piston ring the engine is a OS32 and has only been flown for 34 minutes. ive also been looking on flea bay to see if there are any cheap engines and ive found a MDS38 engine and a OS50 engine could anybody tell me if these engines would fit my shuttle and which one would be the best.
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Hbk2 E sky (3900)motor 10T 25a esc
Extreme 43t pulley
1500mah 15c + 1800mah 15c batteries
Extreme blades + 450 trex canopy
twister V2 FP
hirobo shuttle+2