They are 28-10.5" Hoosier also run a 30-10.5" Hoosier 15x8 rim with 4 1/2" backspace Standard 71 8.5 rearend Trim the 1/4 panel lip Many of the stepchildren have done this combo
Here is my first car. 1968 Buick Skylark. Bought it in 1983 for $500. Worked real hard on destroying it to make it “cool”. Sold it a year later to a guy who wrecked it. I found it in an apartment complex about a year later