Anyone know where I could track down a vintage tire? (Sears Roadhandler D78 x 14)

[Patrick's74Custom]

Three of my tires are great and one is bad. I'd like to track down one replacement and keep them matching. Is there a place that specializes in old tires? I have been checking craigslist and eBay. Thanks.

 

[65Vart]

Three of my tires are great and one is bad. I'd like to track down one replacement and keep them matching. Is there a place that specializes in old tires? I have been checking craigslist and eBay. Thanks.

Coker? if they don't have anything they might be able to help.