When you purchase the tie rod, ask the vendor for the appropriate left and right hand threaded ends. There is one of each per tie-rod. Probably 8mm. Don’t forget to get a couple of left hand thread jam nuts.
Bob – it might not be safe to “assume” they are OEM Arrow tie rods… I would check with an Arrow dealer for what the OEM tie rods are and see if they can confirm what you have to be OEM. Also, some chassis have offset tie rods, where the left and right sides are not the same length. I would check this as well.