I have an F&FP one with the spacer. It was done by Bob way back when he was doing the porting for Kustomatix (another vender on the forums at the time).
Great work. Has worked flawlessly since installation date (about 2 years ago).
PTP or DCR would be another one I would consider going with for a ported stocker.
Mine also hasn't leaked either and it has been tested up to 24 psi (same psi as I run on my turbo).
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