Trying to source a 3.2 replacement vacuum line rubber reducer

[85RedCarrera]

I had to remove the rubber reducer on my vacuum line on my 3.2. It was split, so I cut off the steel crimp and thought it wouldn’t be a big deal finding a suitable replacement, but everything I have looked at this far is not a good fit. The straight rubber reducer on the oil tank (pictured below next to the taller reducer I need to replace) is a fairly close match, but the larger ID is way off, and I think it would be too short anyway. Bummer Porsche only sells the reducer when you buy the whole line with it!

I can surely Frankenstein something to work, but was hoping that somebody may have already done this and found a suitable straight rubber/silicone reducer to use. Seeing as it’s for vacuum, the wall thickness needs to be relatively stout to keep it from collapsing. I could also braze a short extension with a larger OD so that I could use the oil tank reducer I bought.

Any ideas appreciated!