Hoff; Here is what I did on my 1939 Chev Suburban with the same colours as yours. Go to your local parts store and purchase some strip decals, get one with 2 stripes and about 3/16,s gap between the stripes.Any colour will do since it will be scrap when you are done. Lay the strip around your cab and make sure it lays flat and firm on the body. The remove the outer cover. Now paint your Gigalo Green striping. When it's dry remove the 2 stripes and you are done. You may want to move the very front of stripes and place them down to a point.
If this seems confusing, send me an e-mail and I will send a photo of my work.I also added stripes to my wheels.
Stan
[email protected] Good Luck.