Call & talk to them, they sell thick walled bannana grooved shafts with screw in plugs at the ends.. The Bannana grooves won't work with roller bearing but spread the oil providing better lubrication with bushed or metal to metal contact type rockers.. The screw in plugs can't pop out like typical core type plugs causing a loss of oil pressure & they can be removed for cleaning...
They also sell high quality steel rocker shaft hold downs...