I just replaced the guide. I'd avoid a boneyard guide-they're mostly toast.
The new part from Volvo doesn't use a screw and nut.
They include a pop rivet.

The top just slides up into the door frame and you rivet the bottom.

You probably need (2) new green plastic window bushings that come with
new snap rings. Get em at FCP or Volvo.

The thing that messed me up was I didnt understand that the bushings are
molded to accept the round ball joint on the regulator arm.
You need small channel locks to snap them into the bushings,
then put the snap clip.

It's another job thats simple after you do it once.

Good luck, Bill