Is there a guide to the pitch on the threads for the various metric fittings on the US Fit? I usually can find the right metric size, but the pitch varies. Or
should I just buy a metric thread gage tool? Is there a good source for quality metric fittings that anyone has used.

 

just buy a pitch gage tool and save your self a lot of time and money down the road its a pain to retap holes because u stiped them using the wrong bolt with the wrong pitch

 

Shop manual. The Fit has a wide variety of metrics.