Vacuum Unit MGA, MGB,TR3 to TR6, Sprite, Midget to 74

This a Vacuum Advance Unit MGA, MGB 1962 to 1974 #40897-41155-41288, Triumph TR3, TR4, TR4A, TR250 to TR6 to CC58360 and Austin Healey Sprite, MG Midget 948 to 1275. the pull on the vacuum unit is 5-13-10. Cross Ref.# 163-630, 47H5570