I stack 2 Wix 46070 ($5 ea). I add foam weatherstrip on top to keep them tight, which you may not need for some manufacturers. I anyone finds a single filter solution, please post PN's. I downloaded a Wix chart to pick what "should work". The top filter gets much gunkier in the 1985 CA, from the oil in the blow-by. I usually change it every 20K miles and change the bottom one every 40K.
My notes below:
85 CA 300D air filter is 8.5" OD x 4.25" ID x 7" H
Stack two:
Wix 46070, 7.031" OD x 4.28" ID x 3.550" H, $6.07 (Toyota MR2, 85-86, Cressida 80)
Fram CA4282, $7.80
Beck-Arily 042-1350
or
Wix 46218, 8" OD x 6.3" ID x 4.093" H, $13.87 rock (no applications listed), $11.69 at
www.fleetfilter.com (used in air compressors)
plus
Wix 42011, 8.3"OD x 6.47" ID x 3" H, Dart slant six 60-76, $4.54 rock
or Fram CA146, $2.79
or K&N E1000, $32.