The newest Pentax 67 II is about 10 years old - there may be some NOS parts; certainly there are donor bodies. The oldest, first, Pentax 6x7 cameras are 50 years old - who knows how long the components of it's electronically released shutter will last, whether in a particular camera or a donor?
Before buying my Pentax 6x7 MLU, I was surprised to discover it was not fully mechanical - for the last few years I've been deliberately trying to avoid buying any camera with electronic operations. Yet I bought it because it really appealed to me.