Chiming in
Not so sure we should be discussing this in the Classifieds, sorry 8)
Measuring from the deck of the grip frame -to- top of ear.
XRN-3RED - 1.061 ,,,This is what I think most of us have laying around.
Tall Ear from a Mid Frame Stainless Flattop. - 1.108
Doing the math, ~ .047 difference.
This brings up the Question; What guns could/would be a donor for this sought after "tall ear" aluminum grip frame?
Thought; This might be accomplished using a Aluminum RW grip frame.
Recently saw he is doing some Aluminum grip frames, Bisley mid-page here.
https://singleactions.proboards.com/thread/26528/brass-grip-frames-ronnie-wells?page=32