Anyone looking to get a Exploder Dynamo Condenser should be aware of the fact which was unknown to me when I acquired a case for the exploder I had bought here in an antique mall. The Mk 1 and Mk 2 exploders are not the same size! The Mk 2 is about 1" wider and will not fit in a Mk 1 case. I've noticed that there seems to be more cases for Mk 1 popping up and few for the Mk 2. Just thought I'd pass that along so someone else doesn't make the same mistake. I'll still use it for display they look identical (well almost).