Modify permission for Group Members on a forum via widget

Trying to do something like this, but it seems like the RoleId changes for each group I create... 

#set($forumResponse = $core_v2_forum.Create($groupId, "Discussions"))

#set($permissionId = $core_v2_utility.ParseGuid("dc04b058-a57c-4ac9-9ca9-921b9861c86e"))
#set($applicationId = $forumResponse.ApplicationId)
#set($isAllowed = false)
#set($additionalInfoResponse = $core_v3_permission.Set($isAllowed, 531, $permissionId, "%{ ApplicationId = $applicationId }"))

RoleId will change as "Members" is a group role which is created per group.  You can use the Role - List Overload 3 API to list the roles for the group.  The application string in this API would be "groups" and the Id would be the Id of the group.

RoleId will change as "Members" is a group role which is created per group.  You can use the Role - List Overload 3 API to list the roles for the group.  The application string in this API would be "groups" and the Id would be the Id of the group.