C. Davidson,
For rear sights, I'd recommend SARCO. Check your PMs.

CLASSIC whITwORTh STYLE ENGLISh 3 LEAF EXPRESS SIGhTS
List Price $125.00 SARCO SPECIAL! (A-D)
$49.95 3 for $138.95
• Marked 100, 200 & 300 yard folding leafs
• Slide assy. is dovetailed in base
• Brand new, meticulous manufacture
Available in 4 different styles:
A. 3 folding leaves; flat bottom MSR220
B. 1 fixed, 2 folding leaves; flat bottom MSR218
C. 3 folding leaves; round bottom MSR221
D. 1 fixed, 2 folding leaves; round bottom MSR219
E. Folding leaf express sight set without base (to
use in your own design or in a barrel
dovetail) MSR233 $34.50
http://www.sarcoinc.com/12-01-11%201-9.pdf