I have stripped the paint and lettering from a few of my cars and need to get some new decals for them. When measuring the length to buy the right size decals I find most are a little shorter than what they are suppose to be. I measured several different brands and stuff that should have been 40 feet were 38 or 39. Probably doesn't matter but I wondered if some manufactures were more precise than others. My train stuff is all old 50's and 60's vintage Revell, Varney, Athern...