FYI, there isn't a problem with the LIM gaskets in a car that doesn't run DEX. There is a class-action lawsuit on DEX, not on the gaskets.
Series 1 cars don't have LIM gasket issues until well over 100k, and it'* minor then. DEX eats the plastic, so GM went to Aluminum gaskets, and rumor has it that they just recently re-formulated their DEX. It gets corrosive with age.
For your vacuum lines, try the dealer, a wrecker, or go custom with bulk vacuum line at your local auto parts store. As mentioned, the Tees will be more difficult. Are the Tees cracked? Or are they re-usable? If they're ok, you can insert a small piece of your OEM plastic into each one, then slip aftermarket vacuum tubing over them. Make sure you use VACUUM tubing. It'* designed not to collapse on itself under vacuum.