I have had the radiator hoses on my truck since late september, they are sweet. It was when installing these that Brandon and i realized there were some issues with the fitting of the pass side intercooler boot as well as the bend of one of the heater hoses could be better and the straight IC boots needed to be longer. SPA is just now getting the corrected sets out for testing last i heard and hopefully they will start rolling out soon, I know i would love to get the rest of the kit on my truck ASAP, the clamps are first rate and the silicone hoses look awesome. They will not work on a 12valve, the top radiator hose is not the same. Radar doctor, they will work on your 99.