Shifter boot / Bezel Help.

I'm changing my 3 spd, rubber mat floor to carpet and 4 spd pistol grip.. I'm stumped on how this goes together. I was told by Brewer's that the rubber boot goes under the carpet, but that doesn't seem to look or work right. The rubber boot fits like a glove into the bezel out of the car, but if the boot goes under the carpet, it won't go together that way. Also, I thought I saw somewhere a long time ago that there was an oval gasket that went down under the boot, but Brewer's says no.
Some guidance would be greatly appreciated..!!

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