My impeller (Hayward part number SP-1605-C) broke and I need to replace it. I have a 3/4 hp system. I found 2 Hayward kits that will allow me to upgrade my system. One kit has a Hayward part number of SPX2605C which can be used on a 1/2 or 3/4 hp system (your number for this kit is 5110-51). The other kit has a Hayward part number of SPX2607C which can be used on a 1 hp system (Your number for this kit is 5110-52). Would I be correct to purchase your kit part number of 5110-51.The kit for 5110-51 identifies parts incliuded in the kit as 5110-08 (Diffuser Gasket), 5110-9A (Diffuser), 5110-10BA (Impeller), 5110-12 (Housing Gasket), and 5110-13C (Seal Plate). The kit does not include 5110-11 (Pump Shaft seal) Can I assume I would have to purchase 5110-11 seperately. Thank yu for your assistance.