'67 Dart with '68 idler arm?

Hello all. First time on a car forum so thanks in advance for any help. I have a 1967 Dart GT Convertible that needs a new idler arm. Wrenching on the front wheel shows the bolt popping up about 3/8" out of the arm so it's hurt. I've had the car since 1989 and never really tackled the front end stuff but when I brought it to my local mechanic he said his supplier didn't have the part so I should order it myself and bring it in with the car.

So after some research I see the difference between the '67 and '68 arm and it seems I have a '68 in my car. Not sure what to do here. So some questions:

First, Is this a '68 arm?

Assuming it is a '68 arm, should I get another '68? I mean is this some conversion setup and I should just go with the '68 or is it likely something is actually off on this? Do I need to id the Pitman arm and get whatever idler corresponds to that? I'm not sure if the pitch is different between the two years or if it's just the mount style.

Thanks again for any help with this. Looking forward to a smooth ride again!