I hope someone can help me with this unit . I have never owned an old holden with air con. ,at least not for any length of time . Any way I found this old under dash unit and am unsure of what model holden its off ,at a guess probably hk ht hg .Was cleaning it up and noticed that it would not be difficult to shorten the under dash unit by around 150mm to approx.450mm a size that looks right for early holden . I am wondering has anybody done this before ? One of the larger louvered sections would be removed and the controls would maybe look better in the middle . Any information would be of great help ,even just to identify it if I decide to sell it .