Connector set for connecting a floor sill to a fixed frame (310, 320, 330) of a window or of a door, having at least two part-connector sets (100, 100') for the left-hand and right-hand connection side of the floor sill, which each comprise at least: - a rebate corner connector element (10, 10'); - a sealing element (20, 20') and - a tab connector element (30, 30') wherein - the elements (10, 20, 30) of the part-connector set for the right-hand connection side are formed in mirror-image fashion to the elements (10', 20', 30') of the part-connector set for the left-hand connection side, and - the elements (10, 20, 30; 10', 20', 30') of each part-connector set (100; 100') can be combined to form in each case a fixed-frame connector, and - the rebate corner connector elements (10, 10') and sealing elements (20, 20') from both part-connector sets (100; 100') can be combined together to form a central base connector, characterized by an elastomer sealing element (20, 20') and by at least one widening element (40, 50) which can be inserted between the sealing element (20, 20') and the tab connector element (30, 30') of a part-connector set (100, 100') or between two sealing elements (20, 20'), formed in mirror-image fashion, from both part-connector sets (100, 100'), wherein the at least one widening element (40, 50) has at least one profile region which can be severed to reduce its width. having at least two part-connector sets (100, 100') for the left-hand and right-hand connection side of the floor sill, which each comprise at least: - a rebate corner connector element (10, 10'); - a sealing element (20, 20') and - a tab connector element (30, 30') - a rebate corner connector element (10, 10'); - a sealing element (20, 20') and - a tab connector element (30, 30') wherein - the elements (10, 20, 30) of the part-connector set for the right-hand connection side are formed in mirror-image fashion to the elements (10', 20', 30') of the part-connector set for the left-hand connection side, and - the elements (10, 20, 30; 10', 20', 30') of each part-connector set (100; 100') can be combined to form in each case a fixed-frame connector, and - the rebate corner connector elements (10, 10') and sealing elements (20, 20') from both part-connector sets (100; 100') can be combined together to form a central base connector, - the elements (10, 20, 30) of the part-connector set for the right-hand connection side are formed in mirror-image fashion to the elements (10', 20', 30') of the part-connector set for the left-hand connection side, and - the elements (10, 20, 30; 10', 20', 30') of each part-connector set (100; 100') can be combined to form in each case a fixed-frame connector, and - the rebate corner connector elements (10, 10') and sealing elements (20, 20') from both part-connector sets (100; 100') can be combined together to form a central base connector, characterized by an elastomer sealing element (20, 20') and by at least one widening element (40, 50) which can be inserted between the sealing element (20, 20') and the tab connector element (30, 30') of a part-connector set (100, 100') or between two sealing elements (20, 20'), formed in mirror-image fashion, from both part-connector sets (100, 100'), wherein the at least one widening element (40, 50) has at least one profile region which can be severed to reduce its width.