I believe Flex has stopped making parts for the v6. PM rancherlee or lx2sc about the 60mm tb. I have Flex's adapter kit, but they made them fit on their own pretty easily so talk to them about it. www.moranav6racing.com sells the phenolic intake spacers.
1988 Notch Mustang: - 438W, direct port n2o, t56 2003 SVT Focus: - SCT X3 tuner