Best Answer
Spider
,
13 September 2023 - 10:17 AM
I'm a bit perplexed here as when the Rod Shift came out, just about every country in the world had mandated Reversing Lights, so I'm quite sure there would be provision for a switch in your shifter.
As far as I am aware, there was only 3 housing types ever made, all had at least a Reverse Light Switch and some had an additional hole, some of which can be used for the Switch.
The first was a 42H1195. These only had a single hole on the right hand side (as fitted in the car) for the Reverse Light Switch;-


I've included some dimensions on this last one, the horizontal measurement was to the very front on the housing where the steady rod bolts up to, sorry it's out of shot. The measurement from the bottom is from the base of the housing with the cover removed.

The later housing was the DAM3615

This also had the same hole as the earlier type in the same location;-

It also had a second hole on the other side in a different location (also measured to the front as above but out of shot);-

NOTE that on all of these, there's extra material where they are drilled and tapped. The housings as they are are too thin to drill and tap, they are less than 2 mm thick. I have modified some of these earlier types to take a switch in the other side, but I added some material before drilling and tapping.
The thread is 3/8" UNC.
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