Need to replace a tire on my Walker to make a set. Which kind?

[DgBrd]

Hi

Just purchased a 97 Walker model T, For some reason it has 2 different brand front tires. It has a Carlisle Turf Saver 18x9.50x8 on one side and a Dico Multi Trac C/Z 18x9.50x8 NHS on the other side. I want to replace either one or the other to make a set. I want to go with the set that is easiest on the turf.
All your input is very appreciated.

Thanks
Doug

[Brickman]

I buy only Walker OEM. It is pretty expensive but seems to work the best for me. (I was unable to locate after market tires that would fit.)