That fourth one down looks roughly like what you were describing.
Still a job I need to get to in this forced period of non-camping or camp planning.
I had a quick look under my '82, the gear linkage at the back where it enters the GB is very different to later models. The boot there on mine has fallen apart, but donât think the diameters would fit what we need.
Iâll see if I can get a couple of photoâs and sizes on the week end.
Will have to get back to you on that. honestly canât remember, but I want to say the 4th one.
I think I had to cut a little off the big end
So if the internal diameter of the bellows at the rod end is 20mm or larger, will need a screw up clip to hold in place. The question remains, is the bellows too stiff causing perceptible resistance when gear shiftingâŚ
Maybe a good fit plus some lubrication gives the best overall setup. 
Definitely no lube needed nor advised for this position.
Primary function of this bellows is as a seal, to keep out all moisture, dust, debris, whatever, from entering the PVC pipe, plus providing forward & backward movement of the gear rod unimpeded, given the OEM bellows high degree of flex.
At the rod end of the bellows, the OEM part was a âgripâ fit to the rod, (no clip or zip tie required), at the other end it fits over the PVC pipe, held in place by a screw-up metal band. See again my hand drawn sketch previously, itâs self explanatory.
Is this the rubber boot Ken?
Sadly no.
Given itâs an 84-91 part, must be a 2WD T3 part and anyway, dissimilar features for an alternative.
Keep looking?
Among the present possible alternatives shown previously, the one which I suggest has at least two of the four vital attributes as the original OEM part # 251 711 184C would be: https://www.heritagepartscentre.com/uk/251711167F-gear-shift-rod-bellows.html
The bellows portion (concertina) is likely similar in overall diameter (I canât check it ATM). Also thinness of bellows material, so providing similar needed flex and low resistance during gear rod movement.
Itâs the dissimilar forming of both ends is where the problem remains. Perhaps thinking outside the square, someone might come up with a workable solution, say for example, find some suitable diameter rubber rings, necks and/or tubing that could be glued onto respective ends of the bellows ⌠or whatever other smarter solution.
Thinking caps on!
Just stumbled on a pic by mackaymanx (thanks Brent), it better illustrates what the NLA boot Part # 251 711 184 C looks like. It shows it has four working ribs in its bellows section and it grabs the gear rod.
As previously reported by Brent, he used as a substitute the same bellows as I mentioned above ⌠Part # 251 711 167F. It looks like this boot (unmodified) wonât grip the gearshift rod as the original bellows did, but would still offer some protection from the elements. Thanks Brent.
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