Postgate B should be ideal for pretty much all of your SRB's. After having a bit of a trawl, I understand that Desulfovibrio isn't all that fussy, but one or two papers suggest that it might be happier on Postgate A, so that might be worth a try.
If you can find it, looking up Postgate's original paper on Dusulfovibrio desulfuricans (Journal of general microbiology) from the 1950's wouldn't be a bad plan. Another point that might be useful to you, is remembering that here in the UK we spell 'Sulfur' as Sulphur, so Desulfovibrio might end up as Desulphovibrio in UK and commonwealth papers.
Anyhow, good luck