Stab in the dark here Rich but .... Toyota?
Not sure I'd want to rebuild with anything less if I am honest. Exhaust gasket, yeah. Rocker? Yeah OK but if I was putting the whole thing together, I'd get genuine. See what Simon would charge.
Prices with Toyota are always a surprise. Sometimes a shocking surprise and oddly, rarely, a real surprise. I'd always start with a benchmark price from them.