Product review (3 stars): Keep the wheels from your old rack!
My hotpoint dishwasher's bottom rack rusted out.  I read the reviews on this product before purchasing, and others said that the rack is slightly smaller and will fall off of the side ledges when rolling in and out, using the wheels from the old rack solved this problem.  I found this to be true.  The new rack wouldn't stay on the small ledges but putting the old wheels on it definitely worked!