I have four brand new CTS pots for sale. They are all 250k, and have 6.4mm long threaded bushings.
2 x "True Vintage Taper" Solid Shaft, custom made for Crazy Parts in Germany (bought from Six String Supplies in the UK) - £12 the pair posted or £7 each posted
2 x 450 Linear Taper Split Shaft - £12 the pair posted or £7 each posted
Or by all four for £20 posted.
I also have the following used (i.e. installed and removed immediately as I was experimenting with pots and caps over the holidays) CTS 450 series pots for sale. They are all 9.5mm long threaded bushings.
250k Linear Split Shaft, custom made for AxesRUs - £4 posted
500k "True Vintage Taper" Split Shaft, custom made for Crazy Parts in Germany - £5 posted
250k Audio Taper Split Shaft - £4 posted each or both for £7