I have a whirlpool dishwasher ug980scgb2 thats leaking. I ordered a new pump seal kit, with the new impellars,and chopper. I found out that I have the old style seal with a spring, and the new seal is a new design with no spring. But I can't use the new seal because it is a little taller. Their saying that if I'm replacing the old style seal, that I have to order the module repair package ap4008519. It has two completely differant impellars & a new seal.