Blake,
Welcome to Stovebolt.com.
The major differences between the 1954 and 1955st trucks are:
- hood side emblems (hoods and holes in hoods are same)
- open driveshaft in 1955st (transmission and rear end are different)
- different grill paint scheme
Yes, glass and seats and sheet metal parts are the same.
Seats are hard to find, but are the same from 47-55st.
Suburban side glass is the same 47-55st.
Windshied glass is the same on 55st and 54.
Door windows are the same 51-55st
