If the door sill/step and its rounded corners have become rusty, this patch panel is ideal for replacing the rotten area. Specifically designed for Mk3-on roll-up window door classic Minis, but the shaped ends can be cut off and the straight central section is perfect for repairing the flat center section of Mk1-2 sliding window door sills. Ref: MS48R, MS48L, SBO0648, SBO0649.