It is getting much harder. Go to RockAuto and see what is available in stock verses backorder, and that will be a good indicator. OEM Mitsubishi parts website exist also, but I have found them to be hit or miss. My daughter get into a rear-ender with her Monty and the body shop had a really hard time sourcing things like rear brake lights and so forth, I ended up salvaging what she needed from a junk yard, wrapping it up and shipping it to the body shop. The problem was they they can only buy "new" parts by policy, and these days, reman or salvage is what you might need. However, rebuilding the 3.5L is still easy, and there are plenty of gasket kits and so forth still available.