If you change the pump and original does not have the two steel rods in the top of it, a pump 'by itself' will not work even though it looks like it will. The pump had a recall on it and if never changed then you have to buy the entire module. There is NO pump by itself available for the original unrecalled module, they changed the dimensions ever so slightly of the recall new pump to only fit the module that goes with it which also has a different intake filter and top plumbing.