the gasket you are referring to sounds to me like it's the EGR cooler gasket. It should come with the kit. Mine did. Mine wasn't the ITM kit though it was the rock kit from Engnbldr. The only gasket I remember not coming with mine was that gasket for the plate under the intake manifold. Which Autozone actually calls a Carb base gasket.
The kit is gonna be for both 22r and 22re. So you will have some left over. Troll through some of the 22r/22re rebuild threads. Mainly 92 Toy's and Iamsuperbleeder's. I know you have a 22r, but........ Those two should help.