I thought it would be easy to find another plate so I don't have to keep taking the one off of my rig but it seems like I can't find one at all. Is there another brand that will work with this head? Thank's for any info you all can give.

Thank's
Chet

Here's a link to their parts list. You might contact the sales dept.
Libec-Parts List (http://www.libecsales.com/s_parts/s_parts.html)
Aloha
Z

i'm looking for one of these too, did the op ever get a second one?

I can recommend the Kessler Kwik Release. Goes for 150 USD.
Kessler Kwik Release (http://www.kesslercrane.com/product-p/kwik_system.htm)

Photo of how I use it with my tripod:
pic.twitter.com/xkKiu83q

Cheers,
Zexun

thanks for that - looks good!

:-)