There's a nice listing of used OEM wheel options, with pics, on:
http://www.mazdarecycling.com/html/wheels.asp
I believe all the 15" or bigger, 5-lug Millenia, 626 and 929 wheels will fit the P5, ES and MSP cars. Great for autocross or snows. The Millenia 9 spoke are very light - like 11 pounds.
In the past, I've found that their prices aren't always the lowest but the have a ton of Mazda parts.
http://www.mazdarecycling.com/html/wheels.asp
I believe all the 15" or bigger, 5-lug Millenia, 626 and 929 wheels will fit the P5, ES and MSP cars. Great for autocross or snows. The Millenia 9 spoke are very light - like 11 pounds.
In the past, I've found that their prices aren't always the lowest but the have a ton of Mazda parts.