I found build sheet under velour seat, which seemed to be untouched (but who knows after 50 yrs). Why do I have velour/leather seats when every other 300 Hurst has all leather seats? Previous owner didn't know but said doors used to be velour fabric as well but were changed because original cloth fell apart. 1) Why does my broadcast sheet state "38 Special Order" or "Imp set up"? (see pics) I'm guessing this is special to the interior only, since VIN and Fender tag already show its a real 300 Hurst? 2) What does "5" mean in seat box? Fender tag shows "M6T5" which I believe is all leather. I love the feel of these velour seats much more than all leather, so just wondering if owner could have ordered it with velour seats or if all leather seats were stolen and owner changed entire interior to velour, which I think would have been a weird thing to do. Thanks for any help guys!