If your OHLA is a special, it will have a special part number stamped into one of the machined mounting pads at the base of the OHLA housing (see below).  Special part numbers start with the letter ”L” and are followed by 6 numeric digits.
If no part number is stamped into either of the machined mounting pads at the base of the OHLA housing, you have a standard OHLA.  Please call the factory or refer to the OHLA catalog to match up to the housing and shaft dimensions to the corresponding standard model part number.