JD 7200 just utilized existing holes in closing wheel frames. 

Single bolt in each chain mounting arm was used.

 Have had no issues with this setup.

Used the square link drag chains and utilized screw on thread type chain connectors instead of crush link style to attach chains to arms. 

Like these.

https://www.harborfreight.com/material-handling/ropes-chains-hoists/chains-hooks/chain-links/516-in-quick-links-3-piece-69061.html