Quote Originally Posted by Titus
Well, for $2.99, I would order one at the same time as the bearings and give it a try.
Why not verify first, the dimension for the caps that is on the part description.

I'd also check that the trailer ya got is using the bearing part number listed just in case the OEM changed supplier. (About 3 minutes of work to get all this figured out BTW.)
Fits wheels on our Foldable 48" x 96" Utility Trailers. Keeps dust out of bearings
1.971" ID, 2.305" OD