Gravity Outlaw

Hi, Just brought a Yam xs250 1980 "W" reg. I'm try to find the best Electronic Ign conversion but having prob's tracking down a dealer who can supply in the UK, can any one point me in the right direction and any prob's I should look out for. The bike is a right basket case but only need it as a doner. I'm also looking for a few parts. Front calliper, Engine mounts and bolts and rear wheel spacers for a drum brake, can anyone help on these parts. Cheers Colin