The part number on our drawing is 4038357-439. The alternate part number that is shown on the drawing is part number is TI part number 7700801CX. Devon in you technical support help desk directed me to the web site that indicates part number 7700801CA is one of the acceptable alternates. There are numerous alternates as well listed all as suitable subs. What is the difference in the suitable subs and which is best fit for our part?