Thank you very much for the part numbers and the website link, i was able, after lots of expensive long distance calls, to track down both sides in NOS!! I paid $53 a side plus tax and shipping. which i dont think is bad at all!
FYI for anyone looking for the RH side E4TZ-13404-B then good luck! it appears that its very hard to find online. over the phone i was able to track a few down so if anyone does need them id be happy to provide details.
The LH side E4TZ-13405-A was much easier to find both online and over the phone.
From what i found most places have priced the RD side much higher (up to triple) the price of the LH side. this is due to its rarity.
'Shelby' - 1985 bronco XLT, 351W C6, Limited slip 9 inch