So in this one you can see the missing valve stop pin
Here are two different pins, the bottom one is standard and the top is the modded pin which is 7mm in diamater. They are held in place by the cover. Have them make an original one and a 7mm diamater one.
This is what it looks like with the modded one fitted
In this pic you can just see where the bearing is located
Below are expansion pipe spacers. In our case they will go between exhaust and manifold. They are 2mm thick and 3mm thick. You can double them up to make a 5mm spacer