[showstopperz]

I may be wrong but you might not need a rear bar seeing that you have a spyder. If you look behind your carpet covered cardboard in the trunk you will see that a crossmember support brace is already there. It looks like a big X and it is tubular metal. So to me it seems like it would be pointless to install a strut bar in the rear unless you wanted it for looks? But then again with a strut bar in the rear would the top go down into the spot where it sits correctly?
Like I said I may be wrong I never tried this with my spider because as I see it, it would be pointless.