HKS GTII 60MM wastegate port thread size
 

Does anyone know what size the threaded ports for the vacuum line fittings are? HKS sells fittings on their website and they are listed as 1/8 BT. I purchased a few and they will only go about 1 thread in before there is a lot of resistance. I'd like confirmation that 1/8 BT is the correct size before I start cranking on them.