Hi Mike,  You can always visit your FLAR  (friendly local auto recycler) and
after bringing a dog biscuit as is customary, purchase a relay block from
almost any German car.  It will have plenty of just what you are looking for
and often with significant wire stubs already attached to which you can
soldersplice your wires.  Or just remove the connectors you need, un crimp
and attach to the wires in question.

Don't forget a suitable fuse, often the blocks also have a stand alone fuse
connector too.

Cheers,

Al