I need a base plate for a P229 mag. Anyone have a spare or where I can buy one?

You probably need to be more specific.

I think that the Factory P229 magazines have been manufactured by 3 different companies so far. I am positive of 2, Those floor plates are all different.

Then the standard capacity magazines use a different floor plate than the restricted capacity (10 rounds) magazines. Again for each manufacturer

Plus the 9MM magazines us different floor plates on the restricted capacity magazines than the 357/40 magazines and again for each manufacturer

The full capacity magazines should be a common floor plate among all calibers within a specific manufacturer

So there are more than half a dozen different floor plates that might be what you are looking for

My mag is a standard capacity 9mm. Manufacturer is who ever makes the ones that come with the P229 Elite Classic Carry

I think this is what you're looking for. Plus TGS is a great place to deal with.
https://www.topgunsupply.com/s...n-p229-.40-12rd.html