Found out that one of the pistons on my RR caliper was frozen when I was trying to replace the brake pads and discs.

Now, can I replace just the bad caliper or do I have to replace both sides. The replacement parts I bought and the ones on the car are both ATE's.

Thanks.

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1986 300E (3/2002) Rear ended and totaled (10/2009)
2000 Xterra (5/2000)
1992 400E (11/2009) -Sold
1986 300E (12/2009) - Sold
2004 E500 Wagon (6/2013) - Sold