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Discussion Starter #1 (Edited)
You can go for a diff install kit sorted out by specialists for great peace of mind, of build your own from premium parts and Ford OE parts for less than half the price:
  • 1x Diff Carrier Bearing Porsche 944/968, SKF LM300849/811, p/n 113-517-185-C-M92 $26.25 @ Pelican Parts (dimensions are 68x41x17.5mm)
  • 1x Diff Carrier Bearing Porsche 944/968, FAG 32010X, p/n 999-059-027-02-M34 $26.50 @ Pelican Parts, or if you want to stick to SKF, see SKF 32010-X VP (dimensions are 80x50x20mm)
  • 1x Ford Axle Output Shaft Seal $26.95
  • 1x Ford Oil Seal $21.40
  • 10x W700427S300 Ford or Mazda ring gear bolts $20-$40 for the set depending on source (only if you remove the ring gear from the diff or install a new diff)
Total about $120-$140.

If you shop around using the bearing part numbers you can find them even cheaper! I just mentioned the shop where I ordered mine from. Vendors on eBay, as well as 123bearings and other shops sells them at a lower price. They are on many cars and SUVs as diff bearings and/or even wheel bearings, there really is nothing special about them, they are pure off-the-shelf standard parts.

While you are there, also replace the input shaft's oil seal going into the gearbox (this should be part of the kits):
I've successfully tested the Ravenol Racing Gear Oil GL-5 gear oil, a modern synthetic gear oil with maximum protection that is compatible with all diff types (stock, helical as ATB, Wavetrac, or clutch-plated like Drexler) - which makes it kinds-of unique. The oil is compatible with yellow metals and works great with the Synchrotech carbon synchros, as far as I can tell after 2000km.

The gearbox oil capacity from a completely empty and clean casing was 1.95L @ 0mm. Ford says -5mm to 0mm below the filling plug, so you may find slightly lower figures which are still correct, and you may have 0.1-0.2L residual oil when just draining during service. I think more oil is better for temperature, so I went for the high mark in Ford's range.
 

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@axelr Did you also change the counter shaft bearings? Would you happen to know if they're the same dimensions as the diff bearings?

If doing all the bearings (diff + output shafts), I count six in total.
 

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Discussion Starter #4
Two countershaft bearings (and their retainers) came with the synchro kit I brought. That covers one end of the counter-shafts but the other end I did not address. Doing a proper job replacing the counter-shafts bearing might also imply shimming, and I don't know how you'd measure the preload for the countershaft bearings.

Yes that's six between the diff and the counter-shafts, then you have the two gearbox input shaft's bearings.
 
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