The best alternative is the Behr regulator. It is an improved product, much bigger and clearly better heat disapated.

If you get it for a 140 chassis it will comes with some instructions showing it is applicable to 210 chassis. it also has a removable harness that allows conversion without soldering on the device.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician