well, depending on how you define hard to find these three were the hardest to find for me....took me a few years:
Atsushi Yokozeki Project Raid Japanese CD feat. Ray Gillen (RIP), Jeff Pilson, Chuck Wright, Tim Bogert, Kelly Hansen, Jake E. Lee, Brad Gillis, Rudy Sarzo, Carmine Appice, Craig Goldy, Bobby Blotzer, Frankie Banali and more.....
Bill Ward: Ward one:along the Way CD feat. Jack Bruc