Get the Gates Timing Kit. It has the tensioner and idlers in the kit. Get the whole kit. Thats all you need. About the cheapest place you can get it is Rockauto. It also comes with good instructions. Make sure you get the Cam alignment tool and crank pin. They cost about $25 but are well worth it. On the 98 with the VCT solenoid it is very important you get the timing exact.