Below is a photo of a concrete cast of lion 3886, unstained. This is 1 of 7 for a client who required embedded bolts on these to attach them to the wall on the exterior of his house over the windows.
This is just an example of some of the custom applications I am called upon to provide solutions for on retro- installations. As the client has access to the inside walls, his contractor will be able to drill 2 holes through the wood wall, spread on some thinset mortar or equiv., insert the rods through the wall and tighten the nuts up.
Outside he plans to stucco around the keystones and the wall.