Hello.
I cannot answer your question, but I have following recommendation to you:
Would highly recommend to remove all original vacuum hoses and use new silicon ones. I did the same at my Xedos 9, because all of them are min. 17 years old and possibillity for leackages is very high. Especially in your case when all of them are outside the car.
As you in any case have them more or less "in your hand" and easy to change with disassembled intake manifold.
Greetings.
PS: I mean something like this:
http://www.ebay.de/itm/Original-Samc...item51c60613f6
Just select the right inside diameter.