i am going to order the end caps and seals to replace mine because mine are gone. i was on apache sales site and got confused. i saw the end cps for sale ,but further down the page a saw end caps for 72 models. do i need these as well??? so could someone fill me in on this? what is different with the 72? i don't wanna order the wrong parts and does anyone have any for sale i will take them off of you if you don't need them, if not i will order from apache sales, as soon as i figure out which part i need.