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Weil-Mclain Gold Plus 60

Hello trying to see if anyone can help with this question. i need to replaced the DHW aquastat and found this part

For Use With GOLD / Ultra Plus 30/40/60/80
Includes Knob And Instructions
90°F-160°F Adjustable Range
Does NOT Include Cover Plate

but if i read the lable on the DHW it say's only replace thermostat with cover plate. PN 633-900-102. Anyone know why i cant re use my old top plate cover?