Re: rim bore sizes
Bring it to a machine shop - a regular one, not an automotive one. I doubt it would cost much more than $100 for all four.
When you do it, bring a Mazda wheel with you so they can take an exact measurement. This way they will be able to give you exacty the right center bore.
2008 New England Region SCCA HS Class Champion
2008 New England Region Stirling Moss Championship co-winner.
92HS - 2007 Mazda 3s Sport Sedan -2006 Miata Wheel, 16x6.5, 15lb w/ Hoosier A6 245/45R16 (f) and 225/50R16 (r) MS Accessory Sport Shocks
Slow in - Fast out Fast in - out backwards