Trulife 503 A Supreme breast form is an asymmetrical breast form with both upper chest and underarm extensions. It is very suitable for use in more extensive radical mastectomy surgeries. The unique contours of this form fill and blend where surgery has removed tissue. A concave back allows air to circulate between the breast form and the chest wall. Fit: Average to Full. Sizes 1-14 (See Trulife breast forms sizing charts). Choose right or left. NOTE: Replacement covers for this form are style N503R (pkg. of 2) Nude and 503L (pkg. of 2) Nude. Can be located under Accessories and Mastectomy Accessoriess and Trulife Breast Covers.