Which tractor are you working on??
If you are referring to the square rectangular Bargemen style,
The lenses, IF you can find some, just snap on the housing.
Are you saying the housings and all are missing ., or just the lenses?
Any bases I have or have seen are held on by a couple 10-24/32 or maybe 8-24/32 machine screws.
I believe at least one of those screws also holds a little clip on the back side to support the wire jct. terminal.
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