Hi
What set of NOS set of Volvo front speakers do you have? Do you have a model number printed on the front or on the speaker magnet?
Consider looking at the inner door card, the thing that secures to the inner metal door pale, from the front edge. There is a profile to the edge. See where the speaker usually secures in the horizontal recess of the door card? On a 1980, you see the recess and a 4" (100 mm more or less) speaker secured to the door card to both seal the air mass both to the front of the large speaker cone and to the rear.
CB makes mention of the 4", more or less, speakers, you find on more or less 1980s models. In 1988 or so came the HT-204 speaker models that secure to the inner door card with a speaker mount for the (usually Dynaudio brand more or less 5.25" speakers:


An after market item I just discovered using Google image search is:
https://www.kaplhenke.com/products/240-5-25-speaker-bracket-and-grill
Image:

Secure a 5.25" speaker to the front door whether you have power or manual windows. For both 4, 5, and coveted 2 door coupe.
What Uncle CD mentions is the 1980s 4" (100 or so MM) Volvo 240 factory mount:
The speaker grilles:

And the speaker mounts that were the speaker themselves, sometimes:

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The speaker mount come secured to the inner door card using the rivets CB mentions. The grill secure to the speaker mounts.
So, you can mix and match speaker options, yet the most import thing with speaker install is:
- speaker must seal the air mass behind the speaker cone from that in front of the speaker cone.
- speaker excursion must be without limitation or resonance dampening.
- secure speaker to the inner door card only. Not the inner metal door frame underneath.
Some of my images of install:
5.25" speaker install using the later HT-204 speaker mounts in the hirzonatl recess:


4" (100mm) speaker install using after market. Demel or trim to fit the 4" speaker mount to fit the inner door card horizontal recess, secure the speaker and speaker mount to it, and secure the grille to the secured assembly.




Extra info:
http://forums.tbforums.com/showthread.php?t=266691
http://www.2040-parts.com/volvo-240-front-door-speaker-1980-s-brown-grille-rare-2-available-i1211401/
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