These pulls are beautifully chased with the same patterns used in the 1600's. It is unusual for back plates to match each other exactly, but this particular pattern, an exact copy of an early one, did. Use large pulls and small keyhole escutcheons or use small pulls and large keyhole escutcheons. Or use the same size in both places! You will be pleased with the result.
They mount with either cotter pin fittings or MSF fittings. Click on the underlined text to make your decision before you order, the cotter pin is the most authentic, but some customers prefer the ease of a threaded fitting. Once you get the hang of it, cotter pins are easy to work with and you can order extra cotter pins to practice.