As the Lionshead Aluminum Bobcat Trailer Wheel # LHSO320B has a 3.19" diameter pilot hole, I recommend going with the Lionshead Trailer Wheel Center Cap w/ Snap-In Plug # LHCS102-SI60C. This will fit perfectly and the stainless steel construction will resist corrosion. The removable snap-in plug provides easy access for hub maintenance on E-Z Lube axles as well. view full answer...