Modification of K-member idler arm mount advice

Yes, that is a 67 slant 6 k frame. You could probably cut off the correct mounts from your wrecked K Frame, carefully, and remount them, on the 67.
I say this cause I see you are in Sweden, and K frames are probably not easy to obtain there.
I did it once along time ago, I just changed theotor mount.
Ole man Dave