I am about to fit up some new indicators/flashers. I see they have 10W lamps. My question is do I need to replace the flasher unit? The stock is a Hella 12V. 2(4)X21W21W+0...5W. I have taken the indicators down to have an earth wire fitted and plug ends fitted. The Auto-electrician said I may have to get an electronic flasher unit as they only draw 10W. I'm thinking this one may do the job. I have tried to get some 21W lamps to fit but they are all to large.