The S3213 has an 11/16"-16 thread. That is the most common out there...Yamaha/Mercury/Suzuki oem use that thread. OMC used 1"-12 thread(S3214)
S3213 is 10 micron, 60GPH. Its uses a clear bowl for viewing and draining.
You can mount a clear bowl unit inside or outside if you have outboard engine(s). Inboards and I/O must use metal bowl if the unit is in the engine space.
Check Amazon for complete "S3213" kits that include the filter head.
S3213 used to be only Parker/RACOR but now the part number is copied by many brands. They make them look like Racor filters.
Are they as good? Good enough given the price? Thats your decision.
You can also use Sierra 18-7919