POOL motor

Is there a way to convert a pool motor UST1152 to USQ1152?  The USQ has a square mounting flange.

I bought the UST1152 at Backyard Pools Superstore but I put it away for another time. Last week I opened the box  and realized that it was the wrong motor. But I had it almost 4 years and they won’t exchange it. Joe

Unfortunately, there is not a way to convert a UST round flange to a USQ square flange. The shaft dimensions and threads are different.