After researching for hours trying to find a reliable source for the 165/80R15, I broadened the search a bit and discovered that BFG makes their Radial T/A in a 155/80R15. Their distribution network covers the US, making it easier to find a replacement on the road. That's the path I'll be taking.
Claude -- the check is made out and will be posted in the morning. Thanks for working with me on this!