BoMar makes a replacement that will fit the Kimber dovetail, I believe that it has a part number of BMCS-K. I haven't ordered one yet but if my rear sight breaks a third time I will go for the BoMar. I believe their address is http://www.bo-mar.com
Bomar makes a replacment for the Kimber yonkers adjustable Yes (the early ones used an LPA)
Kimber uses the More expencive Bomar brand sight to build there guns NO.
Kimber would have saved money by offering a better sight that would have cost more initally but not had to replace some 2 and 3 times? and pay some shipping charges I suspect. bean counter and precieved value question?