I've been browsing through your thread on R'n'S and the one I've got won't fit that box, which I would say was a GM180, as it certainly isn't a BW35/65/66 from what I can see, so I can't help you I'm afraid.
That says it fits SD1 years 1977-87, so assuming that the SD1 Bw65/66 and GM180 boxes used the same cable, and your box is a GM180, then it should fit at the gearbox end, the top end will obviously depend on what speedo head you're using, but don't quote me on that.
You're obviously having problems finding an off the shelf cable to fit so why not calculate the length required and send that along with the details of the end fittings you need, here:
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