Ruger did not catalog a convertible Vaquero but they did offer in .45 Colt/ACP. I had one and just saw a very nice one for sale at a local gun show. They were limited distributor special runs for maybe Lipsey's? They might have been offered through more than one distributor. I think there were some offered in both blue and stainless, if memory serves, and in 4 5/8 and 5 1/2 inch lengths.