I need to replace a slider, 72x76 isn't a normal size, most sliders are 72x80.
I discovered that, too. I replaced a slider with a 36" door and 2 sidelights. I had to overhaul the door to make it fit. This slider was 78", not 76, so I still had to take it down 2". Taking 2" off a prehung door isn't the easiest thing I've ever done.
“In a time of deceit telling the truth is a revolutionary act.” ― George Orwell
It's not over when you lose. It's over when you quit.
