I'm wanting to order an upper rad. hose for my nova and i see a few sizes.There's this one,Radiator Coolant Hose; Type Single / Small ID 1.28" / Large ID 1.28" / Trunk Height 9.50", and there's this one,Radiator Coolant Hose; I.D. 1.250"; Length 15". The inner diameter is what i want to find out if it really makes that much of a difference.