Hi I have some of the older WD My Book for Mac externals but I want to replace the drives in them. I don’t want to get new ones because I hate the look of the current ones being sold. In my opinion, those older Mac externals were the pinnacle of good design from WD. Anyway… How easy is this? And which 3.5” SATA drives are going to work? I assume as long as their WD drives they should work right? Also which capacities are supported and what tools will I be needing?