Hello!
I THINK I succesfully changed my LIM gaskets. Not as easy as the videos state but I got through it! Gonna test it later today BUT I did break a few things along the way. I'm nearly 100% but this one part I cannot find. It's a U shaped hose that goes on the "Vapor Canister Purge Valve"
I have no idea the ID or OD (it absolutely shattered). I'd normally just grab some vac hose and put it on but this seems quite formed.
I only see it available with some kits that include the whole Vapor Canister Purge Valve. $$$.

Here's a pic!

 

I know mine dry rotted a few years ago. I went to the dealer and got a complete new vac line set. I think those are still made. It was like $20-$30 if I recall. But I have seen people use some standard vac line like you suggested. I bet if you took the enter line/pieces to the parts store they could help match it up.