1888 is Cotillion White, the colour of the paint on the car.

67W is Brown bench seat. Available on HJ from about 3/76 onwards. The bucket seat code is 67V. It is called Tan when on a Kingswood. The Brown vinyl is a single tone Tan is a two-tone. You can see the difference between brown and tan in the scan on this link:

http://www.mysandman.com.au/forums/s...-trim-material