OK Bob, you really want to test this old guy's brain
I believe that Yellow car in BC used to be in Ontario and I think Keith and I saw it at the Oshawa Autofest years ago.
Unfortunately there is very little information available on interior codes for the 69 300's. A few of my source books are way out in left field and don't even show the correct code numbers. One source I have appears to be the most accurate that I've seen and I'll give you the breakdown below. I have never seen a full 69 Dealer Album which might help us here.
Black seems to be very well defined:
751 - Cloth.
752 - Vinyl.
Blue is a bit of a mystery. I have seen Blue in both Cloth and Vinyl. My source gives the wording for Blue as "both" while the Black above has the wording "seggregated" for each (does that make sense?). Seems to be the same Blue code for both - 760.
Green also appears to be well defined:
786 - Cloth.
Mine is 752 by the way.
Also, the seat stripes can be a bit confusing as well. I believe all the vinyl covers got them, while I've seen cloth covers with and without them. Perhaps it is due to some having new covers made and they either included or removed the stripes
The next three posts will have pictures of three different Blue interiors lending more confusion.