I have several listings for Kaiser items:
KAISER BORING HEAD INSERT HOLDER/CARTRIDGE 626.231
https://www.ebay.com/itm/KAISER-BORI...0AAOSwQ~ddkjTs
KAISER 655.601 WCMT020102 New Carbide Inserts 10pcs
https://www.ebay.com/itm/KAISER-655-...MAAOSwqo5db65g
KAISER Rough Boring Head Insert Cartridge Wing 638.141 NEW
https://www.ebay.com/itm/KAISER-Roug...AAAOSwk4ddlk~I
Kaiser 10.614.429 Reduction Bushing 16 RB 9XC3.9
https://www.ebay.com/itm/Kaiser-10-6...0AAOSw~bldkjPb