Your correct there dude, there is the Dimec and Dimec20 the Dimec20 being the firmer of the 2 and probably better suited to astro.
the spec B is the current version of the Dimec's
The original had issues with being very weak on the front kickup and around the rear, where the plastic was cracking and breaking around the screw holes.
so they released the Spec b which strengthens the plastics and addresses the weakness. which is why you need the new front bulkhead as the kit original and thr tresrey ones dont fit.
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