I was going to say factory didnt use Comp Plus after 65.My 65 came withj one.They went from Inland in 66 to just Comp boxes.I have a 71 pistol grip top for my 65 box I change when I pull the OE one.I had to drill it as it was the slip fit type.Supposedly you can drill the Comp box for the stop bolts like the Plus has.Sold the 71 box after I pulled the pistol handle.Rocky