For what it's worth, I just painted my speaker with Valspar tuxedo tie ar2104.
I used the Preval Sprayer kit. It's an acrylic latex paint. I used a 3:1 mixture of
paint / water. The Preval sprayer works but expect it to clog every so often.
You need the full kit which contains the bottle and sprayer, plus 2 other replacement
sprayers. The full kit is about $5.00 and the replacement sprayer is $3.99
If you go to Lowes ask if they will let you take the sample card for the paint and use
your judgement for the match. I thought it was right on for at least my R42 speaker.
I went to LOEWS however the spectrometer could not take a reading
due to the shape of the speaker. One of the reps there spent some
time picking out a color that looks very close. They made me up
a small sample container. This weekend I will paint the speaker.
If it comes out well I will post what the paint was.
I also have a R42 speaker I want to paint.
Do you have a link for the person on ebay selling the match?
I just found someone also but he would not say if it was a good
match for the R42 speaker.
This weekend I was going to take the speaker to LOWES
and have them make me a match. I had pretty good
luck doing this for my NC-300 cabinet.