45C: Nice shooting! You have two options for conversion cylinders: Taylor's & Company. Or: Kirst. Either will work well, in your revolver. When ordering, be sure to specify revolver brand.
By the way, Ballistol is the bp shooter's friend. Use it diluted for cleanup. Proportion doesn't seem to matter. I use either 8:1 or 9:1. (Water to Ballistol). Works well as a lube, too. Once the water evaporates, a thin film of oil is left behind. Or, spray undiluted on cylinder face and and arbor to loosen up fouling build-up. Versatile stuff.
Another great bp cleaner: Isopropyl alcohol(Rubbing alcohol). Dirt cheap and very effective at removing fouling. Have used it, for many years. Highly recommended. Does a great job of cleaning chambers and barrel. Use it mostly in the field, or at the range. Though also good for cleaning residual oil from chambers, prior to loading.
Hard to beat hot, soapy water though, for cleaning up bp fouling. Followed by hot water rinse. Thoroughly dry and lightly lube metal parts, before storing gun away.
Al