Replacing old neo angle corner shower in basement. It's 38x38. Drain is approx. 18 1/2" . When I try to find a replacement base online, most of them have the drain at 12" and I can't find any at 18 or 19. I would call a drain that is 6" from center and offset drain. I'm just wondering why this is and if anyone knows of a manufacturer that makes a 38x38 neo angle corner shower base with the drain actually in the center.