Hal, I agree about finding the exact replacement. It is a very common part as shown in this Leviton catalog file
http://www.leviton.com/pdfs/m2000/M-2000e.pdf Unfortunately this is also an OEM part which means I need to get it from Lightolier who doesn't seem to want to sell individual parts (can't imagine why)or I need to buy 500 of them. Since this part is in the junction box, it's far more sensible, cost effective and easier to replace the thermal protector than the whole light. From a consumer safety point of view I find it hard to believe this important safety device is so hard to come by. Again, thanks for you help.
