A Setback

So... today was supposed to be setting the metal uprights for the pool and doing the finish grading.  The directions for the pool say the uprights should be 42" on center, except the metal pieces that span between them have holes at 45".  Needless to say I was rather put out after discovering this, so I spent the afternoon digging and resetting 9 of the 10 blocks.  This also has implications on the size of the pool.  When I bought it, the seller said it was 15x30.    The directions call for a 15x30, but they also assume 4 uprights each side.  I have 5, at 45" on center so  I am wondering if the pool is an 18x33.  Of course I bought a liner for a 15x33....