This is a QT FLO kit. It features a D size (1.5" OD and 1.36" ID) 7-1/2" titanium tube with a machined in spacer. Side "A" is machined to a 1-3/8" x 24 thread. Side "B" is threaded in 1-7/16 x20 which is standard D thread.
The kit comes with:
(2) 17-4 HT SS cups
(5) 6-4 titanium cups
(1) 6-4 titanium end cap cup
You may add a direct thread adapter onto this kit.
The supplied end cap takes a 1/2" allen key to tighten and does not have a shoulder - (this offers adjustability .06" each way)
Note: This kit does not require any shimming or tuning of any kind. It's truly plug and play.