Order the full set from Phil at FastLane. I received Conti's when I ordered mine. Even though the steering belts look OK, I would replace them while doing the others just because those two are a pain to get to in that you have to remove all the other belts. A little more work now, but a lot less in the future.
The oil leak sounds like a hardened valve cover seal. Remember not to overtighten the bolts.
Mine is doing good. Just passed the enhanced smog check here in California, running strong. My brakes have started squealing too, but only when backing up. I am running aftermarket pads (Bendix) without shims (there were no shims on the pads I pulled out). This noise started recently and the pads have about 20K on them. I'm thinking it's about time to spring for OEM pads and shims. I can clean dust and I hate high pitched noises.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.