Try these 155r15s
https://www.universaltire.com/155r15-firestone-f560-blackwall.html
or this
https://www.universaltire.com/155-80r15-bf-goodrich-radial-t-a.html
OR this 145r15
https://www.universaltire.com/145r15-firestone-f560-blackwall.html
Even skinnier 135r15...