Hmm. I do not know that for a fact. I do know the 12" SS108's and 106's will work fine without any spacers. And I do know that the Douglas Spyders will NOT fit without a spacers. But the Douglas RokStars do fit.
We are learning as quick as we can on all this stuff. Trying to get the best packages we can.
oh and I haven't found anything that keeps it under 50"!
Eric