Hello John.  I do not know whether 135 degree fittings are available.  I do have a better solution however.  In my opinion.  It is also more work and requires a haulout.   Should I keep talking?       Remove the seacocks and thru-hulls and, properly, fiberglass over the holes.  Eliminate them completely.  Temporarily remove the cockpit drains.  Modify them and remount them turned 90 degrees.  That is,  change them from a vertical flow to a horizontal flow.   They can be pointed toward the stern ( my preference) or straight out the sides, if you have room.  If facing the stern, they should come out very near the aft ends of the fuel tanks,  well above the WL in all cases.  Mount new thru-hulls at your chosen locations.  No seacocks are necessary.   Connect the drains to the thru-hulls.  No special fittings are necessary to modify the drains and turn them 90 degrees.    This modification will last forever and greatly clean up the engine room.      That’s just a suggestion.   Good luck.  Dave