insturment cluster lens

1975 Dart Special Edition, w/318.
Last year I noticed I had seemed to have a charging issue. I put the car in the garage and finally got around to it this week.
I pulled the regulator off and it was all bubbled and burned, so I replaced it and that seems to have fixed that issue.
I waited until dark to drive the car, with a full load, lights, blower, wipers, etc. when I did I noticed that the lens has a bunch of light spider web cracks.
I rarely ever have the car out in the dark, and I never really noticed it before. You have to really look at it in the daytime to see.
Now that I see it, I can't help but notice it all the time.
The question I have is, can the lens be replaced without swapping the entire cluster?
I don't want to take the gauge cluster out if it isn't going to come apart.
If it does, I'll find a old cluster with a good lens. If not, I guess I need to find a good quality take out and get the mileage taken care of at a speedo shop.