actually, no, I think you will be able to find a few options that are bulb based
suggest that you do a long search at motrax's website - and other similar sites
My first set of aftermarket indicators came from german ebay - amber bulbs, clear lenses and cost about 25 quid including postage for all four - fausto has them now (If the lazy toad has fitted them.... like his white spring shock....!)
Also, for inspiration look at the aprilia gallery here, and perhaps more importantly at
http://www.apriliaforum.com/forums/show ... hp?t=99893 - lots of ideas there
finally, do not be afraid of the electrics - I was, and still am a novice, but have found many people to help along the way - ie, ask and you shall receive!