If you're looking for an outstanding soundboard version, check out the May 18th, Dallas version. It's really something (despite JPJ's fractured ribs 😉). Arguably the best from that tour and definitively better than TSRTS rendition! You can easily find the incomplete tape in lossless format; there's a DADGAD remaster. There are a lot of good versions of SIBLY, but I think this one is my favorite.
It's a shame most of the US '73 tour soundboard tapes sound so dry. "Oh my tears, they fell like rain..."