You can get any of the part numbers for the Primary on that Bike from 06 and earlier HD Softails That was the last year BD used a Harley Primary in 05 they went to a Baker Primary J&P anything that says 06 and earlier in their catlog or Ebay. You need to install a vent line on that primary Bid Dog did not design their first RSD with a vent it will always leak oil until you do so. Good Luck I have an 04 Bulldog also waiting on my Baker Open Primary that I paid for 5 weeks ago to be delivered any day.