Help! Thermoquad gasket 71 340 - which one?

Thanks for all of the excellent responses - looks like I've got a problem...

I do not have an aluminum spacer. When I bought the car it had an Edelbrock carb on the stock manifold (using a carb adapter.) One good thing was the seller gave me the correct 71 t-quad carb, but one bad thing - it has a cracked "ear" on the plastic part so I can't used the carb at this point.

I ended up buying a replacement thermoquad, but didn't know which type of gasket to use. According to the photos I have the early manifold not the "spring" one. The car was built in 11/69 so I guess that's why it's got the early manifold (at least that seems correct!)

Any suggestions on where to get an aluminum spacer or should I simply use the thick open style gasket pictured above?

Thanks.