Yes MK 20 Lower will fit on a KH-7 check the Splines & Seal area on Drive Shaft for wear. Mark 25 should also work but has a different Exhaust Snout on the foot, if you are trying to keep it original.
there are 2 sizes of shift shaft seal bushings. if the lower is the larger you can change to the smaller OR grind the tower to fit.. otherwise Yes !!!!