Anyone with experience with SB Lunati solid rollers, there are two part numbers in the Lunati catalogue 72420-16 and a later improved version 72450-16, can't find much info on these down under from local parts dealers. There is a new set for sale from a local Mopar guy but I am waiting for him to get back to me with the part number. Anybody know what improvements were made with the later part number and has anybody used either and are happy with them. Thanks in advance.