first and second end surfaces 39 40 are generally parallel and depend from opposite ends of top surface 36 bottom surface 41 extends between the lower ends of first and second end surfaces 39 40 first and second side surfaces 42 43 extend between top first end second end and bottom surface 36 39 40 41 to form the hollow continuation spacer 18 a plurality of stud notches 44 50 are formed in continuation spacer 18 more specifically a plurality of longitudinally spaced transversely aligned cutouts are formed in first and second side surfaces 42 43 the bottom surface 41 extends upwardly into these cutouts each stud notch 44 50 includes a central wall 44 a 50 a generally parallel to top surface 36 each stud notch 44 50 further includes first walls 44 b 50 b and second walls 44 c 50 c diverging from each other as they extend downwardly away from the central walls 44 a 50 a the stud notches 44 50 together are employed to define a second set of positions 51 for wall studs 14 the continuation spacer 18 further includes a pair of adjustable legs 52 these legs 52 are disposed adjacent the first and second end surfaces 39 40 each adjustable leg 52 includes a nut 53 fixed to bottom surface 41 adjacent one of the end surfaces 39 40 the nuts 53 are aligned over bores 54 formed through bottom surface 41 bolts 55 thread through the nuts 53 and bores 54 and at the free end thereof have ground engaging heads 56 application of.