Go plush, not loop.
I've used Knox a few times, their carpets fit ok, but they can take a bit of stuffing around to get them to fit right.
personally I like what Hailest and a few others have done on here and made the carpet using sections of carpet mat.
ie, section to go over the transmission tunnel, then a section either side overlapping that for the floor etc. sits flat, cut completely to shape and looks pretty good too.
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Ongoing Project: 1972 Datsun 510 S13 SR20Det.
http://ozdat.com/forum/viewtopic.php?f=33&t=17898
New Daily: D22 Navara (The new workhorse)
Retired 12/2016: MY98 Subaru Impreza RX
Previous Car: Restored Green 1972 Datsun 510, Hot L18