So whats early and whats late? 
The bearing has NO markings on it at all.. and the seals dont either 
I thought you might ask that......

I dunno. Maybe call Kaymar. Mine was made in April 2000. It has Holden stubs. I picked up a LH wheel carrier, and it came with SL bearings. The LM and SL bearing cups have the same OD, so it wasn't an issue. I just fitted LM bearings and put it on the car.
Ford stub axles are roughly 22mm (7/8") OD for the small bearing, 35mm (1 3/8") OD for the large bearing, 44mm (1 3/4") for the seal.
Holden stubs are smaller at both bearing points, and 38mm (1 1/2") for the seal.
(....disclaimer.......all sizes measured with a steel rule, so are approx....)
If yours has Ford stubs, I've got plenty of SL bearings and seals. The bearings are used, but are fine for wheel carrier use, and the seals are new......... (I changed the bearings on the camper last weekend.......)
Anything else I can help you with.......??......

Geoff