I can now offer you a Spencer rear sight that will fit the dove tail in your Taylor and Cimarron ,Armi Sport barrel without modification. The new base is $ 19. 50 plus $ 2 shipping / h. A complet sight with the new base is $54.50 plus $ 5 S/H or $ 59.50. Sights for original Spencers are still $ 50 plus $ 5 S/H or $ 55 total. To order send money order to Ken Enger, 1795 ivey trace , cumming , ga 30041 or call 770 844 1351