This part is indeed no longer available, at least at the present, as part number 999-201-476-00, 083-311-123, or 083-311-123-TPP. I can provide a good used one -- they are fairly indestructible and rarely need replacement unless something unusual has happened. PM me or email to
catelluseng@gmail.com for a good used part.
I did find someone able to supply it as a new part in the bearing aftermarket, for $125 each. Contact for a new part would be:
SONIC BEARINGS
36-947 Cook Street, Suite 104
Palm Desert, CA 92211
844.849.2933
sheila@sonicbearings.com
www.sonicbearings.com