Okay, my lug nuts look very similar to the ones post in the photo, have the stock rims on my 442. Not sure a generic lug will work with those rims. I am swapping out that 7.5 with a GN rear end, so I assume those are m12 as well cause my lug nuts don't fit on as well. Also since going with spacer those studs may be short, that I will have to measureThe Blazer hubs should be M12x1.5 lugs. I changed my rear ones to match as well, can be done on the car with 7.5" rear. You could try just putting washers behind the wheel to confirm how thick a spacer you would need to just clear the calipers.
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