Whats this Mystery Part? AWARD!!!!

[BGGB]

Im offering the reward of instant Pride and Series Rover know it all to the first person who can tell me what this is. Im rebuilding a bugeye and have the engine on the engine stand pounding on the pistons to remove, when i flipped it over these two half rings fell out. not sure where they came from. i tryed to figure it out but they didn't seem to fit anywhere. Please help.
http://s1173.photobucket.com/albums/r591/roverchild/?action=view&current=131_4153.jpg
http://s1173.photobucket.com/albums/r591/roverchild/?action=view&current=131_4154.jpg

[Moose]

Those parts are the crankshaft thrust washers. One goes on each side of the centre main bearing and limit the end float of the crankshaft.

Brett

[BGGB]

yea you win!!! that was fast. thank you very much. ill have to check it out tomoorow

[east high]

Ugh. Part of those look reminiscent to something I found in an oil change once.