Got two beer taps surplus to requirements. Nothing flash, one brand new, one lightly used. I have invested in a pair of Perlicks (best things ever!). $40 and you can have them both.
I think they are 3" shanks - the usable length to go through the fridge door is 45mm. I had them in my fridge and they were just long enough to go through.
I'm on the north shore (Auckland) or happy to post (your cost).