If you can't find a sightron, I picked up the Vortex Viper PST 6-24x50 for mine and can't fault it (was in the same dog house situation if I got something bigger). Mate has the Sightron SIII in SFP and was impressed by the vortex, was about $300 cheaper too.
I use the warne xskel mount for mine, does the job nicely.
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