Hello Christopher,
Sorry that we are not sure whether all DDC pumps have the same size.
But you can exchange the S1 pump on O11DAPWM to BP-DDCPLS32-PWM with correct screws. Any question, feel free to contact us.
https://shop.bitspower.com/index.php?route=product/product&product_id=5250&search=DDCPLS