Product review (5 stars): Found what I needed to replace Impeller Part # 675468
I needed to replace an Impeller in my 28 year old Whirlpool Dishwasher (DU2900XM-0).  I looked around online and discovered that the Part #675468 was no longer available.  Upon further research, I learned that Part #8193529 would work as a substitute but wasn't currently available.
I eventually came upon this website that offered an impeller Part #675474 that was supposed to work in the event you needed Part #8193529.  Thinking logically, that could work for me. But, I knew, I would be taking a risk.
Fortunately, it worked out great and my dishwasher is back in working order.