This is originally the RED MS3 billet aluminum oil cap, only polished. I have one and it fits and looks great. You'll need an o-ring for them but they're CHEAP!
The alternate completed anodized red ones look like this:
![Image](http://mazdaoflakewoodracing.com/catalog/images/SPEED%20OIL%20CAP.bmp)
The part number is:
BLMS-8M-L02
THIS specific part number IS compatible with our engines.
The OEM part # that is NOT compatible is this: BLMS-89-L34
You can purchase the red anodized mazdaspeed oil cap at any dealer, online, or on ebay such as the following:
http://www.ebay.com/itm/Mazda-3-SPEED-R ... 04&vxp=mtr