Comparison : Item # 120-1, 4 x 1 Intermediate Spacer
Item # 124-1, 4 x 2 Intermediate Spacer
Item # 128-1, 5 x 1 1/2 Intermediate Spacer
Item # 130-1, 5 x 2 Intermediate Spacer
Item # 132-1, 6 x 1 1/2 Intermediate Spacer