I wasn't happy with how anaemic my rear wheel arches looked on my 75 (with 195/50/15s) so I bought a pair of 10mm wheel spacers designed to suit the Alfetta platform with 5 stud. I installed them on the 75 and am very happy with them. They are hub centric spacers and are a tight fit over the hub and into the wheel. They seem well made (turned aluminium). At 10mm there was still plenty of threads on the wheel nuts to be safe with standard wheel studs.
I have since ordered a second pair for my GTV (with 205/50/15s) and installed them. This time I took some photos. Still happy with them and would happily recommend them to anyone wanting spacers. Note, on both cars I have installed them on the rears. I have no idea if they would cause issues on the fronts with scrubbing etc.
I bought them from here;
https://www.ebay.com.au/itm/223719712699?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20220405142716%26meid%3D25bbd2ec1ff347d1b4444f106c69d6fe%26pid%3D101506%26rk%3D3%26rkt%3D10%26sd%3D323980682207%26itm%3D223719712699%26pmt%3D0%26noa%3D1%26pg%3D4481478%26algv%3DDefaultOrganicWebWithV11WebTrimmedV3VisualRankerWithKnnV3AndUltBRecallAndCassiniEmbRecall&_trksid=p4481478.c101506.m1851
They appear to be a Melbourne company and delivery was a few days both times.
Pics
Other side
Attached to hub
Profile