you will only know the part number of the original maker when the bearing is out and you see the maker and the maker part number.
As usual, the transmission makers do not use the same number in their parts list, to confuse people like you who want to buy is cheaper
maybe this helps
http://www.jpat.co.uk/jpat_pdfs/ZF%2...20%204HP24.pdf
check their site
Europeantransmissions*and...
http://www.zf.com/na/content/media/i...E39D80CAD0DA=1
buy a repair manual
http://www.zf.com/na/content/media/i...Literature.pdf
ZF4HP24, zf 4HP24 :: Korobka.com :: Catalog of Parts for Automatic Transmissions
or buy from Zcech Republic maybe cheaper
The list of the automatic transmission types - KAPS Automatické pøevodovky
Next time we do one, I can check, but no schedule to repair one now, too cold.