They were sold by Cosworth but manufactured by Bluesprint Motorsport I believe, however these are the ones that had the problem of cracking, have a read here:
https://passionford.com/forum/genera...oil-pumps.html
There were 2 versions, the 1st was all billet as in the post above, the 2nd had a billet top and a cast body (rumble finished) and was designed to solve the cracking issue, but they both failed however (this is my own one that failed):
This last version that Cosworth made in house (all cast) is fine:
I'm sorry to say but I would NOT use the pump you have pictured, just not worth the risk.