yes all of them carry colored panels, just contact your local supplier
however, if you have to have a certain shade / color of grey then you are better off either painting or doing a vinyl color change unless you are looking for a high QTY.
seems last time we looked into this there was a 20 sheet minimum for custom colors
We could but these signs are going outside and I never feel like ink adheres well to ACM even with the use of a promoter. We do have theIf you use white, can't you direct print the grey background as well?
Thanks. I will check that out