Volvo will happily sell you individual vacuum elbows. You, as an individual, may not be happy paying their price. (Which is true about many -- perhaps most -- Volvo parts and their prices. However, Volvo keeps parts in stock much MUCH longer than lesser automobile manufacturers, so we addicts can indulge our obsessions. It is an exploitive relationship, but I'm not sure if the manufacturer is exploiting our enthusiasm for the cars, or the owners exploiting the manufacturer's willingness to keep providing parts for our aging cars so we can keep them on the road and therefore avoid buying new cars to replace them, thus denying the manufacturers new car sales thus requiring the manufacturers to eke out an existence selling high-priced replacement parts. And that just may be the most convoluted sentence ever posted to Brickboard.)
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-- Bruce / '82 244 (323k miles!), '86 745, '87 760Ti, '94 854

www.fcpgroton.com

Get any Volvo part # from a parts breakdown picture. Get a picture from your nearest Volvo dealer parts department. Buy parts every once in awhile to maintain a needed relationship with these Volvo parts countermen. Turnaround and Email FCP Groton for your needs. I keep a 3 ring binder full of collective parts breakdowns to help with repairs along the way.
In the process you can appreciate how much $ are saved by D.I.Y.'ing a Volvo
Recent 940 cruise control vacuum elbow was quoted to me last week for $2.30 each.
Slight variations in fitting diameter is a mistake. I would stay clear of generic vacuum lines and fittings, since the slightest vacuum leaks can cost you money in poor mileage, or problematic vacuum actuation performance in your vents, cruise, or other vacuum operations throughout the car.
JFK

A good generic vacuum line will work fine, just make it long enough it doesn't pinch itself off.