Parts may be hard to find. Depending on how complex they are, it may be cheaper & easier to have a competent machinist make them for you. This would likely be cheaper than you'd expect, too. I've made several of my own parts over the years - at least as good as the originals, and often better. Several decades ago, before I had any machining tools, I made quite a few parts with little more than scrap steel, a drill, a hammer, & a selection of second-hand files.