Northern auto sells the same manufactured pump that was stock. Around $85 IIRC. Make sure you get a new housing as the stock one doesn't reseal most of the time. Powerstrokeshop.com has them for under $20, or dieselsite.com has the billet unit. I too would add a coolant filter and this is a good time to switch to a True ELC coolant like the Fleetrite ELC good for 300K with no SCA additive. PM me with any ?
NCH