[scoobytuff]

I think the Mazda bolt pattern is 5x4.5. Not only is the bolt pattern different but if they came off of a Mazda Tribute they have a front wheel drive offset. If you took them to a machine shop they could probaly only elongate the holes. This would make the wheel fit poorly and since your blazer is lugcentric they would cause a bad vibration at speed. The issue of the backspacing would cause you to have to use spacers to clear the brake calipers. You may have better luck with back spacing if your Blazer is 4x4. I seriously think you will have a problem finding a machine shop to do the work(liability reasons). If you do it will probably be expensive. Hope this helps.