I have a 2001XJ, AW4, I-6, 4WD and I was looking to replace my front calipers. I recently changed my pads and found that the phenolic plastic pistons had cracked. I wondered if I replaced the calipers can I replace them with calipers that have steel pistons? I could just replace the pistons themselves but I couldn't find the plastic pistons for sale and its probably less hassle to change the whole caliper.