What cal do you need it for? With the original TC rear sight?
I was looking for one too, for my 12" 44 mag. I learned that the 44mg sight IS the tallest that TC made and carries.........I could be wrong, but thats what I recall. I ended up buying an XS sights front dovetail ramp that has the same screw hole spacing as the Encore 1.5". With the dovetail, you can get any height blade or bead sight you want.
Brownells can get you the ramp.
I almost decided to make a new, taller front blade for the encore......would be pretty easy to make. Some have just epoxied a tru glow rod on top of the blade for enough added height, but that ain't for me.