If you can visit a local hobby shop, they can help you with the hardware.  Note that Sig is well known for producing hardware like control horns  I flew mine with an old used Saito 52 4 stroke which was perfect.  Remember you will spend a lot of time cruising around at about 1/3 throttle.  So you need a smooth engine not a hot rod.

Great plane and easy to fly and train on.  You should do well.

Tom