Perfect timing - I just took mine out. The date code of October 92 tells me is the original one for my 1993 Bobcat 853. I haven't tested it yet to see if it still works.
Centered design, not offset
Has a jiggle pin
One more thing I just noticed - the OEM thermostat (and presumably the one Bobcat sells currently) blocks off the bypass port when fully open. Not sure how big a deal it is if a replacement thermostat doesn't close off that port when fully open. Obviously if a replacement thermostat is too deep and hits the port and cannot fully open, then that is not a good thing.
My not-expensive Harbor Freight caliper says you have 1-1/2" from the thermostat flange to the bypass port.
Locate all parts and component information about your Bobcat equipment with detailed visual diagrams and illustrations with parts numbers and add to your list.
and put in your serial number you'll get a part number that hopefully will cross reference to something at an auto parts place. O'Reilly has a cross reference lookup option that shows up after you search for a part number it doesn't recognize.
Makes sense. I just tested mine and it opens fine, but won't fully close. One replacement I found is Stant 45778 - my local shops don't have one, but it's a whopping $14 on Amazon. View attachment 3410