Hi Todd:
Try North East Classic Auto Insurance.
Agent there is Mike Smith (If memory serves)
They have an office in Monroe, CT.
http://www.classiccarinsurance.com/
203-261-8474 or 800-866-6440
The agent there is Mike Smith and he knows Cobras.
Also, check the back of your ERA Assembly Manual, Bob lists a slew of insurance companies that may offer insurace for your ERA.