I have bought these from Frost
http://www.frost.co.uk/acatalog/Inde..._Offers_5.html. Used them for exhaust studs, works fine. Buy some Plus Gas Dismantling Spray too.
George
Anglo-Swede resident near Leuven in Belgium
'87 745 GLE Turbo Diesel Intercooler (D24TIC/M46, 200k)
'88 745 Turbo Intercooler (B230FT/M46, 270k)
'88 745 GL (B200E/M47, 200k)
'89 440 GL (B18K, 90k)