Try these guys....
http://www.bsr-aerotek.com/store/index.php?cPath=2_199
At a guess, you'll need female > female inline adapters from this page:
http://www.bsr-aerotek.com/store/ind...Path=2_199_200
And then the NPT > BSP adapter from this page:
http://www.bsr-aerotek.com/store/ind...Path=2_199_221 (Assuming I have the genders correct)
If you have older DD Based stuff with the old 9/16UNF threaded fitting (HiFlow days before Perfect Seal - current HiFlow blocks are now G1/4"), the adapter to convert that over to 1/4" BSP is on this page:
http://www.bsr-aerotek.com/store/ind...Path=2_199_214
HiPerformance hose and Python Clamps can be gotten here:
http://www.bsr-aerotek.com/store/index.php?cPath=2_186