I bought a replacement air intake hose from Tasca Volvo about 3-4 years ago, and it is a much tigher fit to the throttle place housing than the original equipement.

I clean my throttle place every 10K-15K and this is a little frustrating.
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If it needs to be maintained, repaired or replaced on a 1990 240, I've probably done it. '90 240DL, 287K (Almost There!!) Looking forward to 300K badge (or sticker??). >>You haven't really worked on a car until you draw blood<< :-}

When the original on the 83 failed after about 15 years, I got one from IPD who usually have decent quality parts, but it was noticeably a lighter gauge of plastic. It developed a split down in the folds before long and drove me nuts trying to figure out what was wrong until I discovered it. I've pulled many from later year 240's in the JY and culled down to two good (I think) ones in the spares drawer. OE is best.
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Bob: son's 81-GL, dtr's '94-940, my 83-DL, 89-745(V8) and 98-S90. Also 77-MGB and some old motorcycles.

At my dealer, the drawer where they keep the hose (called "Fresh Air Duct", if I remember right) is right in front of the parts counter window, and the last time I was there when one of the guys pulled open the drawer, I saw that they had four or five.

Anyway, the Volvo p/n is 1367454-4, and the list price was $33.95 (not cheap, but you wrote that you were tired of cheap parts).

Be sure to get a strong clamp to seal it against the throttle body throat -- I had a whole adventure (reported last month on this forum) about failing emissions and a lousy idle, and one of the main reasons is that there was a subtle leak around where this duct (although brand new, and a Volvo part) goes into the throttle body. I thought I had a really tight clamp around it, but a mechanic put a smoke machine into the intake, and a cloud of smoke came up (looked like the BP oil leak) -- he fixed it by putting some black goo around the mouth of the TB and then putting the duct back on, and (with a little more fiddling) the idle and emissions were good.
Apparently, the old throttle body (although I had cleaned it) had enough roughness on its surface that the duct couldn't really seal against the bare metal throat.

Try part numbers 1326110 and 1336080. Tasca shows them at $21 and $23.

Ron J