Replacement laser assemblies for Sony disc players?

The optical pickup is part of complete assembly 8-820-430-02 DEVICE,OPTICAL KEM-460AAA/C2RP. Probably the best source of one would be a working donor, popular optical mech used in a lot of models over several years.
One gotcha, the laser power and servo setup data is unique to each one, has to be programmed to the player in service mode when the optical mech (BU) is replaced, you may get away with not doing that, or not.
Unfortunately, programming the BU data cannot be done by end user, requires service software. Search a service manual and you'll see what I mean. Maybe just replace the whole player with a similiar good used one.