WAIT--Don't call them!
Those brake shoes are for cars with rear disc brakes.
The emergency brake on the disc brake car is a small set of brake shoes that fit a small drum cast into the rotor.
My suggestion would be to try and find a rear axle for sale--some people have converted to a 3.27 rear axle and still have the old one. Others have upgraded to disc brakes instead of drums.
My 230 has nearly new drums and newly relined shoes; but, if I had to buy a new drum at approximately $1,200 each, I would try for a used rear axle or would convert to rear discs. I would sell my used, servicable drum and just about break even on cost.
Try a posting on Parts Wanted. Also, check with the Benz Dr. (Dan Carron). He always has a good selection of used stuff at a fair price.
Joe