The model name and number is SM319, as I posted above. They were an option on Chevy cars and trucks from the mid-'50s until ?.

Info about them.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.