posted 09-02-2009 07:19 AM ET (US)
The S3213 filter is for the Merc STYLE filter bracket, the same style that is the most common in the industry. It has a certain thread size and seal ring diameter.
There also is a replacement for the OMC-BRP STYLE filter bracket, S32114, that uses a large diameter thread and the same diameter seal ring.
The third STYLE is for the Racor bracket. It uses a large diameter thread but a larger diameter seal ring.
The filtering element is the same in all of the styles.
It does not matter what brand filter kit is installed on a motor.
Here is a link to a story about filters and how they perform.
http://continuouswave.com/whaler/reference/fuelFilter.pdf