Is the DG round or oval? There are sparky's available in almost all shapes and sizes. It should be easy to match one up. I did this years ago on my 84 KTM 250 MXC. The only downside of the sparky is that if you follow their directions, it doesn't mount up very securely. It uses one small sheet metal screw and a hose clamp. I ended up drilling three mounting holes and running long screws through the sparky and into the end cap of the silencer. With this set up, it was firmly attached. When team suzuki offroad, ran these on their bikes, they welded the the sparky to the silencer. Team green did the same thing on their desert KX500s. Good luck.