You can contact Industrial Finishes in Eugene, OR at (541) 485-2033 who are the original providers of the paint for WRV. They can look up the WRV paint code and fax you the specific paint formula using the original Diamont paint. They should be able to identify a paint supply shop closest to you that carries the Diamont paint and mix the color.
However, you're wasting your time in my experience & opinion. My efforts to supply a good body shop with pint cans of the colors on my coach had little value and wasted expensive paint. The paint shop reported that only one color came close so they gave up in favor of performing a color match. The results were excellent. I've recently taken my coach into a Freightliner body shop here in AZ who also performed a color match with great results.
My advice ... give up on using the original paint codes. Find a good body shop who can perform a color match.