We had a specially designed sleeve installed on our baja shelf for a market umbrella. We had the shelf designed for our two year old and his little brother (someday) and it is 21" deep from the pool deck. The problem we are experiencing is that every market umbrella retailer is overly concerned with the diameter of the shade, but we need an umbrella that stand a minimum of 11-12 feet tall. Does anyone know where you can get an umbrella with a taller pole or a pole extension?