Yes, it is a direct fit to M03 & M05. But gearing wise it will be entirely different. With the new speed gear for M05 from 3-Racing, FDR would be something like this, with the accompanying pinion choice:-
33T:-
20T pinion => FDR 5.17
18T pinion => FDR 5.75
16T pinion => FDR 6.46
35T:-
20T pinion => FDR 5.48
18T pinion => FDR 6.09
16T pinion => FDR 6.86
Hence, it wouldnt be a surprise for someone with a fast gear set fitted into M05 with a max pinion size of 20T could actually overtake you flat on the straight...hehehe....and that someone when approached categorically denied that he was using any "special" hop-ups, all other things ceteris paribus...huh!
when i see a spade i call it a spade, nothing more nothing less.