These Tight Fit Elbow fittings were designed by PURE Choice Motorsports specifically for 134 A  Air Conditioning Systems, they allow the -6, -8 and -10 hose to fit tightly off the compressor, condensor, evaporator or bulkhead fittings. The dimension from the O'ring inside of the swivel nut to the top of the Elbow is on -6 (1.00) -8 (1.350) and -10 ( 1.650).
If you want to compare to hose ends look at picture on page.

P/N      15150      -6           $39,95
P/N      15160      -8           $39.95
P/N      15170      -10         $39.95