Hi Paul,
Don't know if this affects your new #5 rocker arm, plus I'm talking "second hand" about something I know little about ...
My engine builder ordered new rocker arms for my XPEG from Moss. They were not available, so he ordered them from another supplier. When he installed them, he found that they were too short: the tips didn't land in the center of the pushrod, or in the center of the valve stem - - I don't remember which.
He called Moss and was told that they had found that their rocker arms were too short and had removed them from inventory. I checked - TF rockers are not listed on the Moss site. They are still on the other supplier's website. Probably from the same manufacturer.
The rockers are not included in the parts bill from the builder, so I can't confirm.
Lonnie
TF7211