I also have an EJ25 in mine but its using the RJES bellhousing with subaru starter. The Hi Torque from John Sherman works well but its a tight fit and insulation of the wiring is important as the terminals get close to the gearbox casing, I have one in another syncro currently fitted with a V6 ecotec via a John Sherman adapter plate, although the V6 will go soon inplace of another EJ25.
My brother also recently successfully fitted the Hi Torque to a standard 2.1 syncro with the same tight fit issue. The starter mount is adjustable but the fit is just tight and good insulation is needed. Otherwise the starters work well.
In a 2wd the fit isn't a problem but because of the syncro tank the starter body needs to be rotated and the main terminal is pointing downwards, Comparing the GoWesty and Sherman pictures online, the Sherman one looks a little bulkier, perhaps an email to GoWesty confirming the orientation and fit of their starter wouldn't hurt.
I'm guessing you didn't use a bellhousing to run a standard Subaru starter Bob ?
This setup works well and starters are easy to come by if you need to replace.
Hope you're happy with the EJ25 I find it a perfect match for the Syncro.
great to hear of a 15 y.o subi. I don't know if this stuff is off topic but is your gearbox still original and how many km's ?
That's a bit scary. I'm only 5000 kms into conversion on a 205k vehicle.
I've never had a gearbox issue in my previous 89 syncro now at 325k.
That said I do drive pretty carefully and looking at the repair bills will continue to do so.
Just had a win yesterday with cruise control and VSS now both working after 6 months of finding the problem.
All I need is 12 months holiday to do a lap of Oz !