Thanks Michael. I didn't want to remove the clamps until I had something in hand to replace them, just in case. They are 2 different sizes.
I did get in touch with Tom at the Classic Center and he once again came through. Both clamps are in stock, not as part of a kit. For anyone interested, the part numbers are:
900288-121000
120-995-04-01
$3 and $6 respectively. Thanks for everyones assistance.
Marcus