You have the old style GE/Hotpoint machine which has a round plate behind the drum. The plate has the heater coil, limit t-sta,t and operating t-stat[s] mounted on it.
Try checking on Appliance Parts Pros.com as you'll find some parts breakdowns which will help you.
FYI: The top is held on by 2 screws at the front of the top.
Sunny Side Up, March 2009