I went and pulled out my September 1998 JC Whitney catalog (#615J) and on page 22 & 23 is Custom Fit Seat Covers by Autocraft. The company has been in business since 1942 and has over 5,000 patterns. For the front and back seats the kit cost $189.95 for the Channel quilted Leather-look Vinyl Seat Covers (JC Whitney part# 78KN5990UF). Vertical channels are 1 1/2" wide. Colors available are White, Black, Lt Green, Gold, Tan, Beige, Lt Brown, Red or Maroon. Same fabric by the yard is $27.95. (This is good if you plan to cover the door panels.)

Remember that these prices are four years old. Autocraft is still in business and can be contacted at:

http://www.customseatcovers.com/
or
https://www.seatcoversdirect.com/order.htm

BTW For the 1800 drivers, there are three complete carpet sets also listed on page 25:

Polypropylene Plush Shag # 78KN6611NF $179.95
Nylon Plush Shag Pile #78KN6616UF $164.95
Polypropylene Deep Loop Pile # 78KN6621UF $129.95

This is not intended as a endorsement of the products listed above, but I have ordered the seat kit for the 122 and was satisfied with the product as delivered. Hope this helps.

Oliver
66 1800S