964 Color code help
 

I'm looking at buying used 964 with color code "L37W UA" on the bonnet sticker. The exterior is indeed Midnight Blue, but I need help deciphering the "UA", which I understand is a combination code for all colors inside.

The interior has been re-upholstered at some point, so I cannot tell what the original color was, but the dash is a bright blue (Cobalt Blue?), the steering wheel is light grey, and the seats appear to be white with grey beading.

This seems (and looks) a bit weird! How do I decode the UA to confirm that the seats, dash and steering wheel are original?

Many thanks!

I have a 1991 ordering guide. It doesn't list a "UA" code. But all the codes that start with a "U" are described as "Leather with Porsche lettering cloth inlays". Possibly later years had different colors that weren't available in '91.