A few pointers... IIRC the Mk3 (heavy
) did not work well v a Mk4 i.e. before deciding on which, what will the "other" occupant normally be wearing?
Before even looking you need to know which size you are looking for - M? MB? ML?
If you can get a Mk10 / Alpha better still.
HSL are not cheap, but you'll get the best. Cheap / eBay stuff sounds good, but not only might not give you the protection if you need it
but quickly adds up cost in wasted fuel due poor comms, headaches, loss of hearing.
NB if it has live seats, please do not go down the boom mic route
NoD