Hi, I have a 1994 GMC Yukon and I’m in the process of repainting the plastic dash panel. There was only 4 color options available with this year, make and model. My interior color is GREY and I need to know which SEM Color Code to use when ordering. Will I need to order a color chip guide? If so, do you carry a color chip guide that I can order for SEM? Otherwise if you can tell me which color code to order that will help out. Your help is greatly appreciated!