I wish I could remember. It might have been a stumpjumper from around 2004ish but I can't be certain unfortunately as it's been on there for a long time now. Don't think it will help with identification but the stay was originally silver in colour.
It was a cheap ebay experiment costing me about a tenner which was much cheaper than the rare as hens teeth adaptors that were floating around back then.
It took a little 'adjusting' with a dremmel to fit at the link end.
it wasn't much just a couple of mm reduction in width. As it was a fraction too wide.
Apart from the slight width difference at the link the length of it mount hole to mount hole was identical so the original geometry was kept in tact.
This was purely to get me a factory looking rear disc mount and once powder coated with the rest of the frame came out pretty good imho.