You’re searching for front spring shackle kit. The broken off shackle pin will press out with its bushing for replacement. The pins thread into the bushing, but don’t worry about that at disassemble, just remove bushing and all.
I don’t have part numbers handy but these should be very easy to find, I had no trouble at the time on my 1 and also 2 ton.
Speaking about 1948-53.
The front shackle is same as (or similar) for 1 ton through 2 ton. Not same as 1/2 or 3/4 ton because they have narrower springs. Not same as 3/4 ton rear, 3/4 ton through 2 ton do share rear shackles but they don’t fit on the front springs at all.
I say similar because some kits have longer and shorter side plates and some have nuts on the ends of the pins while others use only a carriage bolt to hold the side plates on, all functionality interchangeable though. Perhaps different part numbers for different applications.
Page in the parts manual.Also see previous page for a picture
http://chevy.oldcarmanualproject.com/parts/1929_54/433.htmI think you want 3682788 or 495034 (second is shorter length)
The 1 ton uses 3847460 which has the carriage bolt to hold it together
