I believe the only "gasket" is the rubber O ring that goes around the T-stat. Phil here at Fastlane has the right stuff at a good price. The O ring does not come with the T-stat

For $20 you coulda proly bought Zerex G-05, which is the recommended coolent for your engine. (or the MB coolent)

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"