k11 brake caliper upgrade.any other car a direct fit?

pretty much what it says on the tin.ive got a set of grooved and drilled discs which are a direct replacement for the solid discs.are there calipers from any other cars which will fit straight onto the original hubs or original caliper brackets that will up the brake performance over the originals,or require minimal modifying?clearance isnt an issue as there are a set of 2" billet adapters going on to fill the flared arches.
tia folks
 
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