The ornamental design of a mounting part for a retractable finger guard for doors, as shown and described.
2.1 is a bottom plan view of a mounting part for a retractable finger guard for doors showing our new design;
2.2 is a front elevation view thereof;
2.3 is a top and front perspective view thereof;
2.4 is a right side elevation view thereof; and
2.5 is a top plan view thereof.
The broken line showing the retractable finger guard for doors is provided for the purposes of illustrating environmental structure and forms no part of the claimed design. The diagonal break lines indicate a symbolic break within the length of the mounting rail and retractable finger guard. The appearance of any portion of the article between the diagonal break lines forms no part of the claimed design.