I didn't test these SUs ones, but GR tried my Weber/Dellorto ones on the dyno a while back, yes they do work. He says anything with a 3mm or bigger radius will work. Mine are around 5mm.
Heh- I blew away all the other N/A cars last dyno day so they must work.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

OK here's two HS2 ones I just made for an ausmini member, they are going into K&N offset filters.
The other one on the left is an HS4 one, for a non-offset Ramflo.

I'm going to have to ask $5 each more for offset ones as they take a while longer to machine.
So offset only HS2 or HS4 stubstacks will be $32 ea, or 2 for $60, posted.
The round ones as shown previously stay at $27 ea or 2 for $50, posted.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.