Hi SunnyInTexas, Unfortunately the hole spacing is not universal, they do make a
universal retro fit pool main drain that has pegs on the underside of the drain that swivel to allow the drain to fit many different hole patterns, the problem is that drain is not flush. The only flush drains that I'm aware of are the
32" pool channel drains, I believe all of the round drains are no longer flush to comply with the VGB Anti Entrapments Safety Laws. I'm sorry I don't have better news.
Thank You
Patrick
www.inyopools.com