Another 135 steering question

[Dirtleg]

Well having spent some time on my tractor now (about 6 hours) I have noticed that it turns significantly sharper to the left than the right. It seems the two steering cylinders are not the same and the right one is binding on itself when pulled in all the way. I need to measure them and see what the difference is.

My question is what would be the correct part number for these cylinders?

Thanks.