1995 Trailstar single axle Vortex hub size

[xdbmb45]

I have a 1995 Trailstar single axle trailer (no brakes) for 1995 Nitro 180FS was wondering if anyone have replaced the hubs with Vortex hubs and what the size would size be? I'll be taking them off but before I do just checking prices.

Thanks in advance!! Mike