Front louvers for Cherokee/Archer overhead vents?

The louvers in the overhead vents in our '74 Archer are so badly beat up
that they no longer work. These seem to be impossible to get. I can find
replacements for the rear overhead vent louvers (longer and narrower than
the front pair) in Aircraft Spruce and Wicks, but no one offers anything for
the front. Our A&P says that you can get them from Piper, but for
ridiculous prices (I joked that they were probably $150 each and he said
that if I could find them for that little I should jump on them). The rears
are $17 each! I've found some plastic eyeball vents that can probably be
adapted, with some difficulty, but has anyone seen a better substitute that
works well? The Piper Owners Group's website is down, but I will check
there when it gets back up. Thanks.

--
Bob (Chief Pilot, White Knuckle Airways)