I did read somewhere that the rear express sight blade off a Ruger 375 Hawkeye fits the No. 1 No idea how easy that would be to buy from Ruger.

IIRC when trying to source a Boddington one, Ruger and I think Lipsey's didn't know where they came from.

That is why I had mine custom made. Getting older and even the fine bead on a double is becoming harder to see! I can't use the buckhorn rear sight on a Ruger.

The safety is very low profile and easy to use. The cases clear it well, unlike the OEM one, which bounced the empties back in.