having problems finding tie rod for 198? 680ck k

I have a 680ck k I purchased about 5 years ago was told it was an 89. Well the left outside piston tie rod popped off the ball the other day now I can't find one to replace it. The serial number 17730675 doesn't match anything I have researched. Measurements on the tie rod are A=3 B=3/4 16 right handed thread. Can anyone direct me to a website where I can purchase steering components for my machine? Thanks in advance

having problems finding tie rod for 198? 680ck k