According to my old Chev book 1937 thru 1946 Chev use a 1 1/4" by 6 3/4" straight hose for the top and the lower uses 2 ea. 1 1/2" by 4 7/16" straight hose. The pipe was not serviced in 1953 when the book was published. 1947 used a GM# 36899602 moulded curve hose. He moulded curve was used 47 through 1951. 1952 used a different p/n again.