I have been working on this paint code thing some more, and I contacted Dumont's to see if they have any PPG codes. Here's what Helen sent me:

Fleetlines late 51 and after, Supers, 3 &amp; 4 digit tractors Green [b:2tipkex2]MAE-45641[/b:2tipkex2], this is the Meadow Green that is on most Olivers.

Clover White [b:2tipkex2]DAR-46536[/b:2tipkex2]
Orange frame stripe for 70 HP [b:2tipkex2]DAR-60080[/b:2tipkex2]

I also did some searching on the web, and came up with a couple of cool web sites. I think they both use the same program, but one is from NAPA, and the other is from Sherwin Williams

<!-- m --><a class="postlink" href="http://www.martinsenour-autopaint.com/formula/cross_reference.cfm">http://www.martinsenour-autopaint.com/f ... erence.cfm</a><!-- m -->

<!-- m --><a class="postlink" href="http://www.sherwin-automotive.com/formula/cross_reference.cfm">http://www.sherwin-automotive.com/formu ... erence.cfm</a><!-- m -->

When entering paint numbers, I found it was best to select the brand and use just the code after 99L (don't put in the 99L) for Martin Senour paints. From there a user can cross the paint to any grade of paint, and if you are a registered user, will give you the 'recipe' for that color. I'm guess you need to be a pint dealer to do this, as I haven't tried to set up an account. Still yet, you might be able to give the web address of one of these sites to your paint place to get a mix. 

Because of these sites, I am now assuming that the Martin Senour paint numbers have changed slightly, and maybe this is causing some of the confusion. Example: the old number for meadow green was 99L-3751. It now looks like it should be 99-3751-L. (See <!-- m --><a class="postlink" href="http://www.martinsenour-autopaint.com/formula/formula_lookup.cfm">http://www.martinsenour-autopaint.com/f ... lookup.cfm</a><!-- m --> for reference.) Maybe this will help makes these codes easier to cross over.

I am also going to attach a handy dandy paint code data sheet sent to me by ABtractor. This is a PDF file, about 380k, so it may take a few minutes to download with dial up, but well worth it. There are 121 pages, and Oliver starts on page 94. It is supposed to be Dupont codes with other brand equivalents. Other than the Martin Senour numbers, I have not tried any of these, so make sure it looks good before you buy 5 gallons.