I got a gasket kit from rockauto that says it's for rebuilt engines; from Enginetech. The engine isn't rebuilt but is old. They are different than the metal gaskets that I took off. They seem to do the job, and I didn't add any sealer to them. Just make sure you get all of the old gasket off, use an abrasive pad to remove any residue, and make sure there is no dirt on the surface. I think this material is on the cheaper end of gasket materials but is thicker than the metal ones they replaced. :)

Thanks those gaskets looks more effective in fact for rebuilt engines in case one leave some dirt or if there is any deformation between metals... (for my understanding) cheers hopefully your montero is all good now.