Those cartridges look like an older style of the Moen ExactTemp® shower valves. The large white valve with the screens is the thermostatic mixing valve and the second valve is most likely a ceramic volume control cartridge.
mixing valve cartridge $120
http://www.moen.com/shared/docs/expl...ws/s3371pt.pdf
volume control cartridge $22
http://www.moen.com/shared/docs/expl...ws/s3600pt.pdf
Note the second page for valve built before 2009. Older model cartridges can still be ordered but not directly through Moen. It goes through Moen but my distributor is the only way I can order it. Might want to check with a local plumbing supply warehouse.
Good Luck.
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