All Bavaria spars are made by Seldén, unless extremely old perhaps. Your 30 Cruiser's definitely is Seldén.
The mast fittings you can simply identify after unstepping, or by climbing/binoculars until then.
The size of the swaged studs is defined by the size of the wire rope. For some fittings there are a few where there are two choices for the opposite end, in which case you must use the one that fits your chainplate.
On some models of the mast step, there is a pin in the mast step, connecting the mast bottom with the step. This must be removed before unstepping, else you could end up tearing something out with the crane. Simply look under your mast and you'll find it.
Also obviously disconnect the mast wiring first and pull it up through the deck. Take photos/label things and then pack the connectors in something waterproof so they don't corrode while the mast sits in the yard.