With possibly some need to do a little fitting on wood grips, most any grip made for the later "stubby" grip Colt "D" frame will fit.
Grips for the Detective Special are most often listed by grip makers.
Colt used Pachmayr "Compac" grips with Gold medallions for years as optional grips, and as standard on the last of the Detective Specials in the 1990's.
The grips on your SF-VI were copies made for Colt by Vintage Industries. The only difference is the Pachmayr grips have a steel insert inside the grips, and the Vintage Industries copies have a plastic insert.
You can still find Colt-Pachmayr grips with Colt medallions on Ebay, the gun auctions, and by asking on this forums Classified section.
You can also buy the current made Pachmayr with Pachmayr medallions.
In wood or synthetic, there are a number of companies that still offer grips to fit.
In a holster, most holster makers still offer holsters for the Detective Special and these will fit your SF-VI.
However, you may want to use a stone to round off the very sharp muzzle. Some of these are so sharp the barrel will actually cut up a holster, and can do the same for your hand.