I ordered a carpet from the Tucker Parts link that GMJager posted. The only color on offer (on the website) for "high hump" floor shifter installations ('49 3600 SM420) came in blue, which worked out fine for me.
When the carpet arrived it looked good, had insulation on the back, good binding, but no cutout for the floor shifter. I called Tucker Parts to see if they maybe sent the wrong one, but no, they don't cut out for the shifter, in case someone has modified their truck to a column shifter. They also said that there's practically no difference between 'high' and 'low' hump and that the rubber mat they sell is the same for both. Lastly, they said you can have any color in the high hump version, you just have to call it in as they haven't gotten around to programming it into the website.
