Finally got it.
Gawd, I spend many hours combined in an uncomfortable position trying to get the bolts to thread.
Looking at the factory service DVD or, WIS, they seemed to think it's necessary to remove the fan to do this,
but finally I just took the bolts out that hold the rad in place, and pushed it back a bit to get some more room.
Seemed to do the trick, got all 3 bolts to thread. Then putting the belt on was a bit traumatic (With ASP pulley).
Finally, instead of trying to get it on the way, while holding the tensioner with breaker bar at full left,
I hooked it in, with just a bit undone on the bottom of the crank pulley, let the tensioner go, and then turned the crank to get the belt on the rest of the way.
Repositioned a bit on the alternator, and finally good to go. Arrgh. Hours. I must be getting old.
No more horrible rattling noise on startup, but still have a squeak.
Might be on the other belt?
Maybe a little Wd40 on the pulleys to see if it goes away?

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2002 C230 Sport Coupe- Orion Blue
ASP Pulley-Supersprint Header-Remus Muffler-
Magnaflow Cat.
TIEN SS Coilovers-
AMG Sways, Wheels, BBK
Tinted windows and tails...