Yo vtboy51,
Welcome!
Ask at local automotive paint supply stores. They can provide in aerosol spray can or cans.
See
http://www.autocolorlibrary.com/aclchip.aspx?image=1968-Fordtruck-pg01.jpg
Fill in... "Exact Color Name"
Also see;
http://paintref.com/cgi-bin/colorcodedisplay.cgi?manuf=Ford&model=Ford%20Truck&year=1968
Ford code M1638 M1638A - blue
This blue automotive paint color is most commonly known as Pagoda Green. Other common color promotional names include Peacock Blue, Peacock, Green, and Winter Park Turquoise. The color formulation has been used between 1964 and 1983, primarily by Ford; but also by Chrysler. We have records of this color appearing on the following models: Ford Truck, Mustang, Thunderbird, Chrysler Special Order / Fleet, Mercury, Comet, and Galaxie. See the full detailed list below.
Ford paint manufacturing codes come in two forms, the short 1 to 3 digit model/year code which changes frequently and the longer 4 digit code which starts with the letters "M", "WT", or "MX70x". M are production paints, WT and MX are commercial or special order. These longer codes don't change over the years for a particular paint formulation; therefore, it is the best code to track the usage of Ford paint. Ford production paint codes starting with "M1" are some of the very early paints which also used an "M2J" or "M20J" or "M30J" with or without spaces or dashes. So this paint is also known as M2J-1638 or M20J-1638 or M30J-1638... Later Ford production paint codes starting with M are usually followed by a 4 digit number and the letter "A" indicating its an exterior paint. The same code ending in the letter "G" is common for interior paints.
Example of the color Ford M1638
See more information on Ford code M1638
Examples of Ford code M1638 (click on image for larger/detailed view)
Peacock Blue 1968 Ford Truck Pagoda Green 1964 Mustang Pagoda Green 1964 Galaxie
Usage list of Ford paint code M1638 (more information)
year manuf model code paint name comment
1964 Ford B Pagoda Green
1964 Ford Comet B Peacock
1964 Ford Galaxie B Pagoda Green
1964 Ford Mercury B Peacock
1964 Ford Mustang B Pagoda Green
1964 Ford Thunderbird B Pagoda Green
1966 Ford Ford Truck D Peacock Blue
1967 Ford Ford Truck D Peacock Blue
1967 Ford Mustang Winter Park Turquoise Ski Country Special, 1964 Ford Pagoda Green
1968 Ford Ford Truck D Peacock Blue
1983 Chrysler Fleet DT7694 Green Ditzler PPG Form 8302