You may want to consider a cheap eBay for $79 for the model 30 and up. You can drill and tap a second set of holes for the 25/27 alignment pins and use grade 8 fine thread bolts. I think the spreader pin holes on the housing are smaller in diameter and a bit closer together.

You are correct in wanting to use a spreader. It is nearly impossible to not inflict some damage to the bearings on install without one. It also greatly simplifies things in removal and replacement of the carrier assembly