Looks like same brackets used on older 20 series JD's and possible older 00 series.

Are you looking for complete assemblies or just sections ?

Before I upgraded to the TSR style knife bar I replaced my sections on those brackets. Buzzed the rivets off with air chisel and replaced with serrated sections from a JD sickle bar mower. Could rivet them back on bracket and I think I even used some sickle bolts for bolt on sections to make it simpler.

Looks like TSR might have an upgraded knife bar for CIH also.

http://www.tsrparts.com/straw-choppers-complete-units-for-case-ih-combines.html

Here is the JD upgrade version.

Not sure if mounting holes would be same dimensions or not but here are JD #s

Part number 12 & 15

Aftermarket double brackets less sickle sections.

http://www.abilenemachine.com/john-deere-combines-straw-chopper-channel-bracket-AMH88800.html

http://www.worthingtonagparts.com/John-Deere-Chopper-Double-Blade-Bracket-Channel-NEW-WN-H88800

http://www.agkits.com/john-deere-header-knife-mount-channel-hth88800.aspx

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knife.JPG (66KB - 184 downloads)

knife 2.JPG (25KB - 171 downloads)