Hi there, a seller on TradeMe "gtparts" in Wellington is listing a bit of NOS Alfa parts incl 105 stuff recently, you could contact him and see if he has anything else lying around?
It's GT Nissan at 38 Kent Terrace, Wellington
The guy dealing with this is Shaun 04 801 5567
I've had a trawl through the 4 boxes (120l storage size) of parts about a year ago, but very little was for the 105 series. I think he has a few lost boxes that occasionally turn up with 105 bits. For the rest of the parts, I don't recall the majority of parts number (maybe 116?)
Shaun's a great guy and very helpful so give him a call