Old school tire question

[Tbruz]

Getting ready for the final touches on my 1972 Blazer.
Going for a total stock off the showroom floor look with steel wheels and poverty caps and period correct tires.

Per the SPID, L78 15 tires were supplied.

I have one Uniroyal Snowplow M&S tire as a spare, came with the truck and looks like it has never been on the ground.
Can't seem to locate these tires(or reproductions) anywhere, Checked online, Coker, Etc.

Any suggestions for a old school looking L78 15 tire appreciated.
Post photos if possible.
Thanks,
Tbruz