GM 305 small block exhaust manifold plugs

I'm working on an '82 Impala and I had to remove the small metal tubes going to the exhaust manifolds due to rust. I believe this was part of the smog pump system which has been removed. Does anybody know where to get plugs to seal the holes? There was a tube with what looks like a double flare tube nut for each cylinder so I need 8 of these.

I tried NAPA and they didn't have them. I can't seem to find them at Summit Racing either.

Junkyard small block manifolds from an older year?

From the pieces removed can you ID the thread pitch/type ?

looks something like this ? http://www.carid.com/standard/second...FYGRHwodNOkEeA

Most everyone just jambs in regular brass plugs, no need for double flare etc., they seal fine.

Thanks
Randy

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Originally Posted by 135sohc

From the pieces removed can you ID the thread pitch/type ?

looks something like this ? http://www.carid.com/standard/second...FYGRHwodNOkEeA

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Yup, that's what I pulled off the car. The original was rusted out.

I ended up going to Home Depot and bought 8 1/4" male NPT cast iron pipe plugs. They seemed to fit pretty good so I'm sure they'll work but I haven't got to the point of starting the car back up yet.