BB 6806 bearings` outside LLU (for protection) and inside LLB (for efficiency) seals; Yes you could, the easiest way would be to buy an LLU bearing and pull the seal off the inside;
NTN-6809-2RS(LLB) - Wholesale Bearings | Japanese Brand
NTN|6307|ZZ|C3. NTN|6307|ZZ|C3 [35x80x21] Heavy Single Row Deep Groove Radial Ball Bearing ZZ=Metal Shields.
NTN 6806-LLB (ULTRA LOW FRICTION NON CONTACT SEALS) BB30 FAST
NTN 6806 LLB Non-Contact Seal Ball Bearing 30x42x7mm Superior tolerances and manufacturing processes mean these NTN bearings are w idely considered to be the finest quality 6806 steel bearing available.