Well, that sort of blows my rightside theory...

Sorry, I've done a number of these Control Arm jobs myself for some friends and relatives [for free].

No idea on labor costs in the real world.
My WAG would be 2 hours per side given a lift, proper spring compressor, and experience. Not sure what the 'book' time is.

Someone here will almost certainly know.
The parts run around $100 per side online.

Best of luck.

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1986 300E 5-Speed 240k mi.