SHORT VERSION:
If the only problem with my "ignition lock assembly" is a leak in its vacuum mechanisms, can I buy just the piece of the assembly that I need, or do I have to buy the whole "ignition lock assembly" ($160 on ***********************)?

LONG VERSION:
After many attempts to diagnose my vacuum problems, I was determined that this was the evening I would find the leak(s). Armed with some new information (found on this site) and a trusty vacuum gage, I spent a good hour going through my car and searching to find the leaks. I'm 99% sure the 3/2 valve was the culprit messing up my transmission and turbo, and I was another 99% sure that a leak in the ignition switch mechanism was the culprit keeping my ACC vents and door locks from pulling the vacuum they needed. That brings me to my point. Do I have to spend around $160 to get the whole "Ignition Lock Assembly" from a place like autopartswarehouse or can I just get the vacuum parts of this "assembly". It looks like the place where the vacuum lines enter/exit can be screwed off, but I can't find just that part on any of the major websites, nor do I really know what that part of the assembly would be called.

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Gig 'em

'83 300D Turbodiesel
'02 Gary Fisher: Big Sur