I have for sale the above. I bought it back in the 80's and never used it all. I bought for my 76 Triumph and just found it again
The paint on it is coming off a little but it has never been used. It's still in the plastic bag that it came in with a Triumph sticker on it. But I believe it will fit Norton and BSA.

Buy now price on ebay is US$79 but I'll take $50 for it.

Looks like this