not that i wish to be a dick but tarmac does state they might need minor modification and a minor modification on a lip can make a big difference in fitment, might be worth pre heating the lip to get it to expand a bit obviously don't drop a blow torch on it haha but might allow it to expand and be a bit more flexible, many people here are running tarmacs lip with out major problems i no mine is tight (still not fitted) but confident it will go
"These lips are an exceptional fit, minor trimming maybe required as standard with replica parts. PU Lips are sold ready for priming and painting, any blemishes found during manufacturing are filled and sanded, this is industry standard. For best results these lips should be bonded to OEM bumper."