O yeah check this out as a strap replacement for the IBH its for the ACH/MICH. It may work and its a hell of a lot cheaper then the oregonareo upgrade kit, but no pads.
X Style
http://www.ops-core.com/ACH_Head-Loc...tion__P2C5.cfm
H Style
http://www.ops-core.com/ACH_Head-Loc...tion__P1C5.cfm