So after 4 thermostats, I still have not managed to found the correct one from me engine. Can anyone tell me what water pump I got? It's not the correct one for the car, it does not fit any of the thermostats I have bought so far, because of the groove in there.

Looks like the type used on the 560SL. Try ordering a thermostat for an '86. Looking up the parts list on Pelican, they clearly show the gasket for that fitting in their parts library for that year and model.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

The top location is not the thermostat location, and as a consequence does not have a register for a thermostat. The thermostat is located on the right side of the water pump.

Lol you are absolutely right Frank, man do I feel like a goat now

Sondrusen we all have problems like this ,so not to worry.
I remember my car turning up after purchase, and i was unable to find the service brake to release it, has i need to put the car on to the drive . So the forum was the place to find out how i could release the service brake. Thanks for the forum .