Now, for Hans von Hammer: The rubber bumpers are the color called for in the instructions, but I always thought they looked a bit off. If you know what color they're supposed to be please let me know, as I can easily repaint them. Flat black, maybe?
Personally, I'd go with flat dark grey for what's likely gonna be a sun-faded rubber (unless they're treated with a product like Armor-All, like the afore-mentioned BC's quarter-ton got ) ...
I only pointed them out (as an interesting choice of color, not an "incorrect" one) because they kinda "jumped" out at me... Instructions are sometimes wrong on paint call-outs, especially if the manufactrer used a restoration as a reference... Yours look like leather, which isn't beyond the point of credibility either... Drivers will always "personalize" their mounts, even if it's just a little thing... Like taking a rifle sling and making leather bumpers...
However, it's ultimately your call... I only point things like out when someone asks, "whatta ya think?", and then I only answer based on personal knowlege.... I mean, that's what they're askin' for.. (right, 'Duke?)
I'm no "purist", as I myself use a lot of fictional markings from spurious units on my models, unless I'm depicting something historical in my dioramas (meaning, that it actually happended and to this crew/driver/pilot) or when doing a commision gig... Keeps the Rivet Counters at bay, ya know.. But if someone wants to know, then I'm all about helping 'em out with whatever reliable info I have...
At the same time, giving someone "artistic license" doesn't mean that "anything goes", unless that's the intent of the builder.. It's the same way with scratch-building and being a "Creative Gizmologist"... While Gizmology makes it possible to re-create the general shapes of things not easily seen or included in a kit, it does not give one license to conjour up fictional stuff outta thin air and the parts-box.. It just allows you to give the impression that, "there's something important down there"...
Those that disagree with that can do so freely but nevertheless they are, whether innocently or not, "enablers", rather than "supporters", IMHO... The whole, "if you're having fun, then forget what anyone else thinks" thing stops when you ask for opinions and observations... I know that I always ask, simply because I need at least one other set of eyes on the subject I've been staring at too long.. Need a fresh perspective...
Constructive criticism is something we ALL can use from time to time... It also allows for growth in the hobby...
Wouldn't you agree, 'Duke?