The O-rings that will work for you are as follows:
-014 1/16" thick (0.489" I.D.)
-112 3/32" thick (0.487" I.D.)
-206 1/8" thick (0.484" I.D.)
-310 3/16" thick (0.475" I.D.)***
Those are very close to the O.D.(within 0.010", except***) of the endstub so you they should slide easily. If you want a tighter fit, just subtract 1 from each "dash number" I gave you.
-014 1/16" thick (0.489" I.D.)
-112 3/32" thick (0.487" I.D.)
-206 1/8" thick (0.484" I.D.)
-310 3/16" thick (0.475" I.D.)***
Those are very close to the O.D.(within 0.010", except***) of the endstub so you they should slide easily. If you want a tighter fit, just subtract 1 from each "dash number" I gave you.