Forgive me for being so inquisitive, but exactly what are you trying to accomplish with installing 500E brakes on your 190E? If your car has a 225hp stroker motor in it, I'd say, "go for the bigger brakes". However, anything short of that, I'd have to say you're better off spending the money on nice 16" AMG-type rims and performance tires. If your desire is still better braking, you might want to consider: slotted rotors, sport brake pads, and stainless steel braided brake lines. Hope this helps.
* 1986 2.3-16V; Pearl Black
* White-faced gauges
* 16" AMG rims (Pearl Black center, polished lip)
* Euro headlights, clear blinkers, smoked taillights
* K&N air filter