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This case is specifically for the Commodore 64/128 1541 Ultimate II cartridge created and sold by Gideon (http://www.1541ultimate.net/). This case is for the Release 3 (last version) of the tape adapter for the 1541 Ultimate II. There were two other versions prior to this board, that are not compatible with this case. Make sure you have the latest tape adapter board. I will be posting cases for the first and second revision of the 1541 Ultimate II tape adapter cases shortly.
Coming to you as a two piece case, the device is sandwiched between the two halves, and you supply the screws to told the case together. Plan on using M2 screws no longer than 6mm.