First I'd like to correct your opening statement. It should read "47-54 rear springs".

Now if you can find a set from a '55 first series you won't have a problem. The hole is centered on 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.