I had Dillon send me a replacement powder reservoir and discharge chute for my old 450 and they did it free of charge. The reservoir is the same as what they presently use with their modern powder measure, but will work with the old style base that came with the original powder measure system. But if I were you, I would go ahead and spend the money for the pugraded priming system as it will have the tubes you need and is automated and smoother than the original priming system I find. I also upgraded to the present powder measure system they sell which is also automated and I find it much better than the original, which for me had problems with some powders.