Mr2u53

Okay so I bought a set of taps and the only one that would fit was m12 1.75 so I used a 13/32 drill bit to drill the holes then I used the tap and went to get some m12 1.75 helicoils but they don't sell that size the guy said it was an odd ball so I went online and got some and they don't fit I was wondering should I just not use helicoils would that work or what size would I need to put it in I checked Google and didn't see anything