Looking at the Schaller website, you can get replacement M8 studs for the STM bridge so that it will fit directly on the kit as it was designed to work. I don't know whether you'd be able to get the studs easily anywhere else apart from direct from Schaller. The studs are €10.53 plus postage in nickel or chrome; other finishes are a bit more.
The Schaller roller bridges come as standard with posts with M5 threads that are too small for the kit (and a lot of other) post inserts, which have M8 threads. But Schaller do sell M8 posts for the bridge separately. I’ve got a roller bridge and the posts on order direct from Schaller to try out on my ES-3 to try and cure my bridge buzzing issues. It is about the lowest height bridge you can get, and it should end up as low as my modified Nashville if I’ve measured correctly, and I can sort out any string spacing issues at the same time. The gold plated version isn’t cheap though, almost as much as the kit cost, so it better solve my bridge problems!
The different kits have different issues. The Gretsch ones seem to be OK with regards to neck angle and bridge hole positions for the builds I’ve read about, so hopefully you’ll be OK. Two-piece floating bridges are normally taller than tune-o-matics, but being wood, they are a lot easier to modify and lower if necessary, though there are limits. as to how much you can take off before the bridge becomes too flimsy or flexible.
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