Ill be using 2 BOVs for a supercharged
setup running 10psi.
Just wondering if anyone can suggest a brand or
a link to one they have used?

Turbosmart?

Just out of curiosity, why would you run two? Are these going on your A-series?

You might have to aim for the more high quality items as the cheaper ones might be harder to synchronise, but that's if you want them to purge simultaneously at uniform pressure settings. I guess the placement might also be relevant?

SC suck through need two in my case so the sc backfires
can relieve the pressure quickly.
I will place them evenly on both sides of the plenum.
I wanted to use stock factory ones from factory turbo
cars but none as far as I know are set for 10psi.

I could even have one set at 9.5psi and the other at 10psi.

In the past i have just made a flat plate that covers two large holes in the plenum.
A hole is drilled in each end of this plate for studs that are screwed into the plenum to go through.

Use some soft motorbike valve springs or similar and nyloc nuts on the studs to set the required blow off pressure.

Of course there is a sheet of rubber between the plenum and plate aswell.

As you know, its only there incase of a backfire.

Cheep, Easy and very effective!

Another thing thing to think about.... You set the boost pressure with the blower speed, eg 10Psi. You would then have the blow off set at maybe about 20psi or higher. High enough to prevent any chance of it cracking open unless there is a back fire. Otherwise you will be filling the engine bay with explosive gasses. As long as it is set lower than the pressure that could possibly damage the manifold or blower when or if there is a back fire.

Totally forgot about the gases in the bay!!!! yikes thanks Simon...
what a cockocany of stupidity that would have been near the exhaust!
I like the plate idea above the plenum as a cover plate also to have
access to the bolts to hold the SCharger as discussed earlier.
That plate will would kill 3 politicians with one sexual smear campaign...
blow off valve effectiveness
cover and access for bolts to supercharger
access to die die-grinding/cleaning/radiusing up inlets tracts

also adds motorcycle valve spring technology to the humble a series :)

in the begining I had a home made pop-off valve in the underside of my plenium with a teflon poppet valve incase of backfire. But I found it was weeping a bit of fuel, so I did away with it.

Scary!!! somehow need to have a bov with the venting to somehow
be let out into the atmosphere.

Cant you plumb the gasses back into the intake like a stock setup?