Guess I'm impatient... I called Jeff.
These are not going to be a new line of drop spindles. They are replacing CPP's normal drop spindles and all part numbers will remain the same as the old.
CP4S1=60-62
CP4S2=63-70
CP4S3=71-72
CP4S4=73-87
Jeff said the new spindles are lighter and a much cleaner casting. Now to get the funds
