Deere shows DRAFT LINK END, LH as subbed to RE590358, if you use the older pn RE55265 and google search ASAP shows a price of 293.00.  I did not dig deeper at that point to see that the RH link is $750.

Now if all you want is the larger ball to fit the pins on the implement, the CAT IIIN ends AL79194 and AL79193 are 375 and 400 from Deere and or 200 and 675 from ASAP.

EDIT TO ADD:
The angle of the ball is slightly different on the CATIII vs CATIIIN so may require a slight tweek to get it to slide on the pins, but if used with a quick hitch might work.

Like others said arms from another tractor like a 7800, 4440, etc would work or you could simplye swap out the draft link ends with one of them.  As I recall the ends will interchange on quite a few models.
A third option would be to contact JB Tractors in Brandon MN and see if they have any claw style they have removed from machines and install them.  Then just leave the ball on the implement.