Registrars or Implementation?
I'm not sure what you're asking. If you're asking about registrars - the companies which register companies to TS 16949 - there are several (I'm not sure off hand exactly how many) and there are quite a few threads in the Registrars forums on the whats and whys. Read through the threads in the Registrars forum to get an idea of what's going on.
As I said above, there are several large, multinationals who are 'accredited' to register companies to TS 16949. One off hand I know of and can recommend is
DNV. While I haven't worked directly with DNV, what I have heard has been good and a couple of the folks at DNV regularly come here to help people out. That - to me - is a pretty nice thing for a registrar to do. If you would like to contact the folks at DNV, Sidney Vianna helps out here from time to time. I know of no other registrar which helps out here so to me it's something to consider. DNV Certification is a division of Det Norske Veritas (DNV) an independent foundation established in 1864 as a ship classification society. Obviously they're doing something right to have been in business this long.
But... You titled this thread "...How To Select Regulatory For
Implement Iso/ts 16949..." From this, if you're talking about
implementing TS 16949, it is not a regulated industry. There are many consultants and companies which assist for a fee. There are small consultants like me to large, world-wide companies which will help - the fees range from dramatically so I won't even address that issue.
And that is why these forums exist. For free, as you know, you can ask specific questions and get help implementing. Or, at least we try to help as best we can.