Best bet is a zeiss jenna 20mm 2.8 flecktogon. Shouldn't be too hard to convert to PL. There is also the Mir 37mm, but that's not that wide. There is the mir-20, which will match the look pretty well, but it's just a copy of the flektogon.
I've been working on doing rehousing of the jupiter-9 85mm, the helios 58mm, the mir-37 and the 20.