Lifter and cam question

..................From my experience with the DC and MP lifters from the 70s/80s and 90s yes there is a difference in where the pushrod seat is in the lifter....... .075 thou lower for the BB lifter.........I have measured many sets from back in the day......mopar always had a different part number for each engine family..........kim.........today it just so much easier to manufacture 1 size fits all and change ur pushrods to match........dam, I was thinking hyd lifters