Hello everyone, I'm trying to get some advice on a repair I'm planning following a hard drive failure on my 2009 iMac. While I've got it open I'm going to replace the optical drive with an SSD but I'm having some trouble finding the right caddy. I'm needing to get this done as soon as I can so am looking for ones available with UK Amazon Prime. The one I nearly got was a 9.5mm Macbook one, assuming they were all the same. After realising the one I needed was 12.7mm the only ones I can find on there mention being specific for Windows laptops. I just wondered, does anyone know if this is just a generic part and any 12.7mm-2.5mm caddy would fit in a 2009 iMac or is it just a question that mounting holes are different? Any help would be gratefully received as I'm really confusing myself here!