Gates heater core hose set. Sold with both hoses.
This is for the S13 SR20DET.
I was hoping that this was a 3/4" (19mm) Inner-diameter to 5/8" (16mm) Inner-diameter hose set. It is not, the inner diameters of both hoses is 19mm thus you still have an inner diameter that is too large to fit properly on an USDM s13 heater core fittings.
I will say that the shape of the hoses is spot on and would otherwise work great.
I will most likely try wrapping my heater core fittings with duct/electrical tape to enlarge them a little.
These hoses make a lot more sense than others I've seen on the market(Enjuku). Possible to install with the engine in the car, easier to do before hand though. Dont waste your money on hoses from somewhere else, just get these and be done with it.