lucas also make bore guides for just about any rifle including coopers,I have had the sinclairs and they are good but lucas's are much better and come with a solvent port and rod guide that centers the rod in the bore guide.
either will work but i think lucas is better
do s search for lucas boire guide,he doenst have a fancy webpage,you email him tell him what you need and he ships it out and then you can send him a check after you recive the guide and are happy with it, not many people out there will do that
Jared