Question: MH-53 in 1/144

Hi all. Ok here is my question: I have a couple of Revell 1/144 CH-53G kits which are in (no offence) rather boring Bundes Heer configuration without the intake filters and external tanks. Now, I know that Revell released these parts in the past in an MH-53 boxing but it is not available (at least for where I live) anymore. Are there any sources where I can find update parts for USAF/USMC CH/HH/MH53 parts?..or should I try to scratch-build them? Thanks.