Quote:
Originally posted by BlueSideUp
The rear slider is the problem. It measures 80.5" tall but is 70.5" wide. The standard size is 71.5" so we're short by 1" and there is no room to change the opening.
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The old slider is nothing "custom." It is hard to tell from your photos, but I suspect you won't have a problem getting a replacement in the opening.
Your rough opening -- the block to block measurements once the old door is removed -- is what you need to determine. Remove some of that inside trim/drywall/plaster or whatever that is in the picture and see what sort of space you have behind the side channels.
The new door manufacturers will give you "rough in" sizes, but that normally will assume room for shimming. You may currently have shimming, or the back side of the aluminum channel has built in spacing. But odds are there is enough room.