The jam in question (Eric Clapton & Peter's Mac) is available over on that Sugar Megs site. It is around number 472 of the current listings. Clocking in at over 17 minuets it is an interesting jam and the quality of the recording is in my opinion good not great and very listenable.
Here is the link:
http://tela.sugarmegs.org/latestadditions.aspx
Peace,
-Al