I was curious about this a while ago myself and called both Baldwin & Donaldson about these particular filters. The following is the skinny on these flters:
Baldwin B2-HPG
About $8.25 at Fleetpride Truckcenter.
Synthetic media, 395 sq in
Beta 6 micron = 2 or 50% efficiency
Beta 22 micron = 75 or 98.67% efficiency
200 psi burst rating
19 gram dirt holding capacity
Flow rate = 2gpm @ 3psi, 3gpm @ 5psi, 6gpm @ 15psi, 9gpm @ 25psi.
Donaldson P169071
$14.70 at the local Caterpillar dealer
Synthetic media
Beta 7 micron = 2 or 50% efficiency
Beta 22 micron = 75 or 98.67% efficiency
200 psi burst rating
38 gram dirt holding capacity
Flow rates not available
I also checked on several other Ford compatible brands. These two filters seemed to be the best to me. The Donaldson holds twice as much dirt as anything ellse I coud get info on and I wonder if this might be related to the new offer Amsoil will have as a 25,000 mile/one year filter. I also like Purolator Pure One, but "feel" these two have much higher flow.
I am currently running the B2-HPG on my 1996 Ranger 4.0l as the full flow on an AMsoil Dual Remote Bypass and as an inline tranny filter using a Permacool fullflow adapter. The Donaldson may be somewhere in the future, but I still have a few Baldwins on the shelf.