What does get very confusing is GMH superceded the part numbers for a lot of HK-HT stuff with HG or even HQ or imported stuff for part numbers for bits that will interchange but aren't exactly the same. Examples are the guards, bonnets, heads for HK GTS327 and even the heater box drain rubber thingy. Even Rares get caught with numbers, they've used a HT part number for replica HK GTS guards. Easy to do, especially when HG parts were being sold new for HK-HT in the 70's and 80's.