Here's a comparison between the stainlless 1858 Pietta that does not dovetail the loading lever catch stud under the barrel, vs the stainless 1858 Uberti dovetailed one. Uberti on the left and Pietta on the right.
I know some earlier Uberti stainless ones back in the 70's were not dovetailed. But today they are while Pietta's are not. Here's an interesting article from the firing line that covers some of this from back in Aug 2010....
http://thefiringline.com/forums/show....php?p=4197694
The grips on my stainless Pietta Remy are not horn, but are dark wood. They are perfectly fitted. But I'm going to replace them with the faux ivory polymer grips that have the brass insert and I'll use my own stainless bolt. Should dress it up real nice. Saw one fellow online who wanted to trade his faux ivory grips for a set of wood ones. Would have been a perfect trade but he never e mailed me back.