bought these http://www.ebay.co.uk/itm/4003298691...84.m1497.l2649 - assuming they would come with the necessary connector to use as a pair but they dont (bike has a single horn at the moment) I've had a look on google but not really sure what I need to look for! is there a simple way to hook them together/connect to the single horn wiring on the bike?

thanks for any advice