Jack, I too have a 2003 with the Summer Bronze paint scheme. I had a local Diamont paint supply shop obtain all the color formulas from Industrial Finishes who maintains records for Western RV paint colors using Diamont paint.
A copy of the formulas is also available on the ACA web site but I'll add it to this post for your direct reference. Please note that the paint code Western RV calls "Alpine Gold" was actually listed as "Light Pewter" by Industrial Finishes and no "Alpine Gold" exists in their records. I will have some painting done in October which should verify the "Light Pewter" color as being the "Alpine Gold".
Bob Bowers (Surprise, AZ)
2003 Alpine Coach 40' FDTS
2014 Jeep Cherokee Lattitude