If this IS the Fillmore West show, YEAH! ...but it does seem coincedental that all of these tracks are also on the Tea Party comps so I won't get my hopes up for it being the Filmore gig. I would guess it's (some of...) the Tea Party stuff...again! However, if anyone does find out that these are from the Filmore show then PLEASE DO post about it here!
The only FM version of IYLMLY I know of (that has been released legally) is from the "Live in Boston - Remastered: Volume three" CD but Peter had recorded it in the studio with the Brunning Sunflower Blues Band for their "Trackside blues" album (if that's of any help).
John