They are the Delphi version of the CAV type glass bowl filter, bought online from Ebay/Wagga Tractors. Delphi 296. Depending on where you look they are either 5, 5.5 or 6 to 9 microns!
The diesel in the glass bowl had a fair bit of fine sediment in it, whereas the diesel I drained from the standard filter was very clean.
Fitting the primer bulb is probably one of the best mods anyone could make I reckon (IMHO). I also fitted one when I fitted the CAV filter (I copied Macca) & it makes priming SO easy compared to those silly short stroke pumps on top of the standard filter. Would be worthwhile even without the pre-filter. I also found that not all primer bulbs were rated for use with diesel, & shopped around until I got one that was.

If I was fitting the pre-filter again I'd consider putting it on the passenger side of the motor, even though it would significantly increase hose lengths, only because accessing it where I have it is a bit too squeezy, making the task of replacing the filter element & re-bolting the assembly back together a bit of a juggling act. I suspect that if I ever need to replace a filter element out in the desert it will provided sufficient motivation for me to move it when I get back home.

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