Broadbent,

If you are looking for the front, I put these on my 48 3600. worked good, the only extra item I needed was U-bolts for the front axle/spring.

https://www.ecklerstrucks.com/chevy-truck-shock-brackets-front-1947-1955-1st-series.html

I am still looking for upper shock mounts for the back, haven't had a lot of time to devote to the search.

Jon