[TowerTalk] Which Rohn Thrust bearing to use

[Dave Thompson]

After many years of using a crank up I am switching to a Rohn 45 guyed tower. I plan to use my 30 year old laddermast to mount a Tennedyne original T-10 and then mount my 2 el Cushcraft 40 above that by 9 feet.  I am looking at Thrust bearings.  I used Fafnir bearings on the crank up but I am looking at the TB-3 and TB-4 on the Rohn 45.
The laddermast is 2.25" so it looks like I need the TB-4 as the max on the TB-3 is 2".

Is this right?

73 Dave K4JRB