Just for grins here are the solenoids for comparison. The 39 only R6 is short with flat bottom and two terminals, The 40- mid 48 R9 is long with a bump on the bottom and has 4 terminals, the mid 48 and later R11 stayed long but went back to two terminals. I don't know if they will all physically mount to a different year OD but if so, they will not work because plunger length and operation is different.
Attach file:
R6.jpg (16.04 KB)
R9-R11 .jpg (17.73 KB)
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