I think later rear openings are slightly different than earlier models. You may have some fitment issues to work thru. Others who know better than me my chime in.
It's whatever you prefer. There's nothing wrong with barn doors i ran them for yrs on my 72. They do want to close when parked on a sideways slope. My 75 has a hard top with amby doors, so when the top is off the back is open, I'll be installing a drop down tailgate. That's my preferences. If...