Schmackey, Try www.nill-grips.com. They should have several styles, though they are a bit pricey. Also, we can get you Herrett Nationals, which have both a thumbrest and adjustable heelrest for about $55.00.
------------------
Don Williams www.theactionworks.com www.pickagrip.com
------------------
Don Williams www.theactionworks.com www.pickagrip.com