Bypass shower door installation problem

What is the best way to fill the gaps between the shower door frame sides and the shower enclosure?

With the frame sides plumb, the gap at the top on one side is 1 inch and on the other side it is 7/16 inch.  Gaps are measured at the top of the shower enclosure (67 inches) with the frame sides in contact with the enclosure at the bottom. 

Just so we are thinking the same can you post a picture..?

You should put some pictures on it so that we can fully understand. Its hard to just picture it out.

Instead of a picture, attached is a dimensional layout of the  shower enclosure. On each side you can see the dimensions taken at 10" intervals vertically on each side from the vertical plumb position (wider at the top than at the bottom).  One thought I have is to cut a wedge of white  PVC to fill the gap between the shower enclosure and the shower door frame to work as a backing/filler.  Unfortunately the wedge(s) would be long and difficult to produce. 

6646.shower door.pdf

I'm sorry, but can you upload that as a picture here.?

Looks like your side walls are not plumb.

Ideally, the shower would be re-framed so the side walls are plumb then refinished in tile. The enclosure install would then be a snap

That said, most shower enclosures have a side jamb that is 1.5 - 2" wide and accepts the enclosure frame so you can play with the amount of frame that sits inside the jamb.  You should be inside the tolerance for the 1 and 7/16" gaps.  Just make sure you get the enclosure frame in plumb so the door operates and don't rack it hard to one side or the other.