this is a tad late, but anyhow:
500E brakes are NOT a direct fit, you will have to replace the entire steering knuckle. The 500E uses R129 components, whereas the 190E doesn't (obviously). Even the 16V only has W124 components.
A better, more cost effective swap would be to go to 400E providing the 2.6 uses 300E brakes as well. I don't know if this is the case.
also bear in mind the offset of the rims...the 7.5" evo II's will NOT fit over the 500E caliper
'93 500E black pearl/black leather; 89,000km; 245/45-ZR17 Michelin Pilot SX; 17x8.25 factory EvoII
'93 500E bornit(blackberry)/black leather; 69,000km; european delivery; 245/45-ZR17 Michelin Pilot SX; 17x8.25 factory EvoII
'88 560SL desert taupe/dark brown leather; 89,000km; Euro headlights
'87 190E 2.3-16 black pearl/black leather; 55,000mi
'70 280SL white/red; 135,000mi (original); factory alloys; Euro headlights
[This message has been edited by yhliem (edited 09-30-2000).]