The single piece is what I have seen on all mine. W123's and W126.

Just about any import auto parts place ought to carry them. mine did, viking imports. ATE calipers do not have that setup, Bendix uses the springs. ATE uses the metal plate thingie...
John

I buy all my parts from http://*************** because its in Arizona and i can get parts in a day. but i dont see these clips on their web site. the pads dont look bad but should i replace them to see if the clanking stops?

How about the MB dealer...?
 

As much as I hate to say it, sometimes the dealer is the best place to go for a pad kit. I've purchased pads from NAPA and that's what you get...the pads.

When ordering parking brake shoes from Performance Products, I just get the shoes. When I ordered them from the MB dealer, (Rahal in Pittsburgh) for justs a few dollars more, I get the new springs and adjusters and new caliper bolts...It's worth it to me.

the tenor man

corerect.

Either will do, but ATE is perfered (they also have a better pin system)