Cheezypoof

Hello I've got a 1978 450 SL with a cream exterior and a dark blue interior. It has 87k miles and runs great. I've been restoring it over these last few months and I have a parts list that I would like to get some advice on.
I'm looking for;a power steering pump, alternator, antenna mast(the bead broke and now it won't retract), fuel pump cover, the dashboard has cracks from the sun so filler I guess.
Most important is the hardtop pulley, it's the original manual one and its a tangled mess! Does anyone know how to operate it or have a manual?
I'm going to be replacing all these parts and would like to get an estimate from a professional so I know what to expect.