odd size spherical bearings

I am having a devil of a time finding an odd size of spherical bearing. It is a 33mm od x 18mm bore teflon lined bearing. Originally these sphericals were made by NMB and the model number is MBWT18. I cant find the originals or anything that will interchange. They seem to slot right in between MS-10 and MS-12 sphericals. Race-Part doesnt have them, zip on McMaster, National Precision, NHBB, Baker, Aurora, FK, Pacific, IBSCO, etc.

Right now my only choice is to buy replacements from overseas for over $70 each before shipping, or buy new plates.

http://www.eminebea.com/content/html/en/spherical_list/spec-1-06.shtml

From this link:

http://forums.nasioc.com/forums/showthread.php?t=2084451

In reply to EvanB:

Yup, contacted the distributors listed by Minebea (NMB). No luck

EDIT: Race-Part is a distributor and NHBB is a subsidiary of Minebea.

Any way to get some with the same OD, larger ID and then sleeve them down?

Call McMaster, if they don't have it, they will find it.