I dont know much about Prime-Loc units except that they dont seem to do well on 24V's.
But I wouldn't limit yourself to only looking at Prime-Loc. When I look on the shelf at work at all the different fuel filters for Cat, Mack, Detroit, Cummins, Perkins, International engines... I mostly see spin on replacement elements. I like spin on filters because they are easy to use and less messy in my opinion. I really dislike any kind of cartridge filter... either oil or fuel.
Stanadyne, Racor and Napa make nice aftermarket spin on heads... ones that can out filter and out flow the stock ISB filter setup. What could be better than an easy and quick fuel filter change? And how about one that has better filtering, water seperation, and longer life? Its possible and easy really. You can get WIF and heaters to keep the stock features too.
Stanadyne is slightly different in the sense that the filters look like spin on elements but actually push up into place and a lock ring is the threaded part that hold it up there tight. Works great too cause there are no actual threads in the filter... threads which can have burrs that dont get removed during manufacturing. I've seen Fleetguard Stratopore FS1022 spin ons for ISC CAPS injection pumps (very critical to have a good filter) with big ole burrs just hanging on the threads. I carefully inspect all threaded filters before installation.
Anyway Stanadyne makes filter heads with many types of port threads including M12x1. 5 o-ring so a person could adapt banjo fittings. With a simple piece of angle aluminum about any brand of head could easily be mounted in the stock location. The Stanadyne FM100 heads and filters flow 80GPH. You can get filters in 150, 30, 10 and 2 micron ratings. All have water drains in the bottom and WIF capabilities. Filter lengths come in 3, 4, 5, 6 inch lengths. You can also get some in 7" lengths.
I use a Napa filter head on a Cat motor on one of our vol fire trucks. The filters are 6 Micron and are the same size of our Fleetguard oil filter. I also use the same head upstream with a 8 micron seperator filter. Both are good for 45GPH which is basically the same as our stock cartridge units.
TDR member Kyle has converted his to a very nice looking Racor setup in the stock location with all the bells and whistles. Racors are great too and there are many choices in size, microns, and optoins.
Don't mean to toot my horn too loud but I think spin on's are the only way to go. Thats why I use two on my ISB Dodge. The Stanadynes offer me better filtration and are good for 10-15K miles. Cost is about $12 for a replacement. And replacements are also sold by Fleetguard (rebadged Stanadyne units) and called the "Super Filter".