need help with a code on a '72 buildsheet

[BUQUICK]

I was looking at the buildsheet for one of our cars and noticed a code that I did not really understand:

Y10 Custom Build-up

I'm sure it is probably something common, I just wasn't sure what it means exactly and thought someone on here might know.

[Duane]

Gary,
The UPC code "Y10" is for the custom/deluxe front and rear door panel trims. Some production plants split the deluxe interior packages into their seperate codes instead of listing the one for the overall package.
Duane

[BUQUICK]

Thanks, I knew that you could help me with this one.