When you get them they'll have to be line bored with the head like they are new, you can't just swap them round unfortunately. Did you buy it off dan page? If so he was told about that on the itr forum and I'd send it back mate
As above, they wear so it's important to have the right cap in the right place.
I go a step further and do the bolts in order aswell, not sure if it's a must but good practice anyway.