Help me identify these lower control arms

..... but as with any polly bushing, they transmit more noise and feel into the chassis as compared to rubber bushings. Trade offs.
Not really true. I highly doubt anyone can tell the difference in NVH between a clevite bushing and a johnny joint.
 
They are black, probably polyurethane.

The arms were new, bought many years ago from an AZVJC member with connections to Daystar. So maybe they were experimental or replacement bushings for a JJ arm? I dunno.

Old bushings and inside of arm.
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Those are standard cheap split bushings. The housing resembles something a flex joint housing like a Johnny Joint. But it does not look like anything Currie/RockJock ever put out. Regardless, they don't really belong together.