I'll have to look and see if I have any M42 adapters around - I haven't had or looked at any M42 glass in a while, so I might have sold it with the last M42 that I had (probably a 50/1.4 SMC Takumar).
If you don't have the matte screen for your MkII, you should get it - it makes all of the difference in the world.
Do you remember what it looked like? The ML's (C/Y mount) look pretty different from the DX/DS/DS-M lenses (M42).
Also, can't praise the EG-S screen enough, definitely wouldn't be comfortable shooting fully manual all the time without it
Though now I'm selling the 6D for an a7_ which should be even easier for my MF lenses 



















