ended up taking it to my mechanic. There was a vacuum leak somewhere in else that was causing misfires in #4 & #6. Plus the valve cover gasket that they replaced a while back was leaking, so they are replacing that, and I believe they are replacing the valve cover. They let the truck set for a few days and placed a camera down #4 & #6 to see if there was any coolant that might have caused the misfires. Luckily, they did not find any. Can't wait to pick it up. It's been in the shop since last year.

 

 

to answer my own question - https://www.roverparts.com/Parts/LZN100220LG
Might need 20" extensions to tape it out from the other side. Apparently they can fall inside - which could be why mine is missing?

 

https://www.roverparts.com/Parts/LZN100220LG