ET Open ruleset sig_ID range

Hello,

Sometimes i need to disable a specific rule and edit it with different fields but in a different file (like, for example, modified.rules).

Does anyone knows the range of the sig_ID field that is used by the ET Open ruleset? I´m afraid to get a conflict when i need to use a new sig_ID in the modified rule?

Thanks.

SidAllocation < Main < EmergingThreats is the most current documentation I am aware of. Hope that help!

JT