DOH!! First post and I already got in trouble

Hanging head in shame
From what I'm reading it may be more practical to find a 8' stepside to lengthen. Looks like almost any 60-87 Stepside box will work.
Doing some CL searches I turned up a couple 73-87 stepside long beds.
For a more fitting look I'll add 60-66 rear fenders.
Here's a couple pictures the seller took. Waiting for a shipper to pick it up. I wish my buddy that did the local view took pictures.