Just figured I'd add an update on this subject. I sent off to SMS Auto Fabrics for some samples of the L-2613 and L-3096 Parchment vinyl. The L-3096 is actually listed everywhere as a '67 color and is referred to as Light Parchment. The color difference in person is HUGE! The L-2613, which is listed as a 1966 color is a dark tan and almost looks like Saddle. The L-3096 is a more "creamy" color, kind of like a slightly more tan, off white. This is actually the color I needed, and is the same shade I've seen in '66 cars with a D9 interior.
As a side note I previously color matched the carpet samples with an original, unfaded piece which was the lower layer in the front/rear overlap under the seats. The only company I could find with the correct match is ACC and it's listed as Dark Gold. It;s not 100%, but super close. Charles had previously listed this color some time back on another thread. I still need to make sure the headliner/sunvisor material is correct (or at least close). This is a super aggravating color to get everything matched together!!
Thought I'd share my findings so far with others in hopes of helping avoid the frustrations I've had to go through!