Odd oval liner replacement size

[Onslow]

I had a pool contractor come out to give me a quote on liner replacement. I was not sure if the length was 32ft or 33ft so he measured it and said it was 32' 6" x 18' 3". He added that the liner needed to be sized exactly right so with that a custom-sized liner would have to be ordered.

The pool is Aquasphere and I can't seem to find anything on if they (or anyone else) sell such a size. Do AGPs lose dimension over time or what's going on here?

 

[Casey]

Are you sure that the water hasn't displaced the buttresses on either side of the pool over time? How old is the pool? Are the straight walls still straight? I know oval pools are put under a lot of stress because the water wants to form and therefore the walls take on more pressure than a round pool would. I'm thinking, and I could be wrong, that maybe your straight walls have expanded out (even if only a few inches), forcing the oval pool out of line. Is the pool firmly set in the tracks at the bottom?

 

[Onslow]

Unfortunately it was there when we got the house (about five years ago). I know nothing of its origin and Aquasphere brings limited Google results. It has buttresses running along the sides (top is surrounded by decking). I can't imagine someone making a non-standard size.

I'm going to have the other contractor in town take a look at it for second opinion as the first is wanting to sell a $600+ custom-size liner. Didn't know they made such things. Purpose of this thread was to see if any background or experiences were out there on this situation.