Coming into this party late... Thanks for the support guys! :-)
Like Special-K says the colors are really close between the Light Gold/ivory and Parchment/white.
While a Highlander plaid insert would be an easy change on your seat, the cost and effort for original fabric is likely about the same and probably also available from SMS Auto Fabrics.
If you are taking votes my first would be the original Light Gold/ivory cloth. Second would be a gray Highlander plaid but it may be too white against the Light Gold/ivory vinyl.
To help with the original interior colors 70 here is a link with some relevant pictures.
http://67-72chevytrucks.com/vboard/s...51&postcount=9