just did some mesurements of my old HU (AIWA CD-MP3). I used it with the sleeve that came with it. The sleeve measures about 2 and 1/8th inches, bust over to a web page that has inches to metric (hey, I'm from the USA, metric system? Bah!) 2 inches = 50 mm......1/8 inches = 3.175 mm.....do some of that fancy math.....I get 53.175....check the FAQ Full size of EMPEG is 55 mm.......gonna be close.....

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VW R32 Empeg 50gig 'Stormy 3 has snuck in a dodgeball' - Stormy 1