Oem Gts Kelsey Hayes 4 Piston Calipers
Even though Auto Zone lists these parts as available on their website they in fact, are not, at least in the Northwest part of the states. Same thing with Partsamerica.com, which is Schucks Auto Supply. I had to go to Calipersonline.com to get mine. The $100.00 core charge (each) can be avoided by shipping your cores to them first. I ordered the stainless steel piston variety since my car will not see daily use. Does anybody have newer, better info on availability?
You did very well going the stainless steel sleeve approach for the piston bores. Basically you should be troublefree for a long time. You have no worries about availability at this point, as your calipers are the best they can be, and should last indefinitely. There are piston seal kits available if the seals ever leak, but with your stainless upgrade should be good for a long time.
There are a bunch of older threads with info. on caliper/rotor availability.
Off the top of my head, O'Reilly's, NAPA, and brakewarehouse.com have the calipers, but you must come to the auto parts store with all the parts numbers in hand, because the counter people do not have catalogs with the info. Summit has aftermarket slotted,cross-drilled rotors for $79.
I think Red is correct that there are no spindle repops at this point.
Hopefully if we keep our K-H setups well greased and adjusted, we will not need spindles, but certainly, there will be some who will need them.
Red gives good advice; Save the spindles for yourself or someone else.