Need more info. on yours.

Do you want new or is used okay ?

Do yours have springs for resetting or are they the fixed rigid type ?

Height of shanks there was some earlier discussion in Machinery Talk about differences between 1600 and 1610 shanks some say there are different heights ?  others say thickness is only difference ? 1600 I think were 1" thick 1610's were 1.25" thick. I thought I checked and they are interchangeable except for thickness. Thicker one would maybe need a different cast piece the spring reset mounts on to go over the thicker shank ? 

In Texas you might try this place they appear to have many frames and partially dismantled plows. Maybe they part them all or sell pieces ? I don't know ? if you call them please post back with what they have and will sell separate.

https://www.fastline.com/listings.aspx?locations=4d034448-64b7-48b3-bba1-30948b09aa4d&nozip=1%2c1&mml=_John+Deere&_=1496258193157&category=Chisel%20Plows

https://www.fastline.com/dealers/kaddatz-auctioneering-farm-equipment-sales-(hillsboro-tx)-hillsboro-texas/4d034448-64b7-48b3-bba1-30948b09aa4d.aspx

I'm on the same search for 2 complete 1610 shanks and stub bars.

Made this post about it. https://talk.newagtalk.com/forums/thread-view.asp?tid=710120&mid=6044499#M6044499

For 1610 's

Found a couple rusty unknowns for 1610 in PA $200 ea

https://www.fastline.com/John-Deere-MGD-TRACTOR-EQ,-INC-LEBANON-PA-equipment-detail-c4d0d1ad-d6ab-4056-a61f-1c36032c8f82.aspx

Lots of 1610's in Idaho.

http://pacificstatesequipment.com/other/G-5/

Talked to them $250 for better complete shanks have others with more wear they would sell for less. Sounds like they would break them down for possible UPS shipping. 

Please post back with anything you find will do the same if I find any for 1600