@dennisspeaks there's eBay. (= It may be wise to buy some dirty cheap faulty machine for spares. For using optical drive internally, you will need a special bezel - which is almost impossible to come by separately, so you will most likely need a machine with optical drive included; separately sold optical drives with bezels are crazy expensive. Without the bezel, optical drive will wobble and bounce - I checked. For T901, there are modular HDD caddies with bezel available, which you could use to DIY a bezel for optical drive - but there's no such thing for T902, sadly. Consider using an optical drive externally, via usb cable - it might be a better option, much cheaper at least.