I think I need a new washer pump grommet to STOP the leak in the windshield resistor tank first, THEN I hope my local MB dealer has or can order these 4 O rings you speak of.
THANKS, I appreciate your time. If anyone else can add, great, please do. I'm new to MB's!
I'm headed to NAPA for heater hose, worm gear clamps, and 2 different hose couplings; ONE 5/16" to 3/8" step-down and ONE 3/8' TO 3/8" AND a 3/8" 1 foot long hose. I BYPASSED the coolant lines at the tank and never have worry about leaks or coolant/washer fluid swaps again. Bypass pic posted below. I capped off the washer fluid lines and worm clamped them too. $23 to complete. No leaks from washer tank yet and the MB dealer had one in stock! The stock grommet had tighter hole for the pump to slid into VS the original grommet that leaked when I pulled the pump off. I guess they reinvented it.
The dealer did say the 2 grommets for the thermostat on the heat exchanger COULD be ordered separatly as well as the thermostat (MB calls it a pump) also FWIW.
For future ref in this thread see below links.
OK, FOUND -------->
https://www.pelicanparts.com/techarticles/Mercedes-W124/17-WATER-Windshield_Washer_Reservoir_Pumps_and_Level_Sender_Replacement/17-WATER-Windshield_Washer_Reservoir_Pumps_and_Level_Sender_Replacement.htm
ALSO:
https://www.youtube.com/watch?v=BjWBXIdYHU4