Fits all Hot Spring spa models (except prodigy) from the 2nd quarter of 2002 thru current models. This pillow is at its longest is 13″. On the reverse side of the pillow the openings (where the retainer is inserted) the distance between them is 7-3/4″ from the center of each opening.
Cool Grey pillows were used in spas colored Blue and Jade (green). Please contact us if you are not sure what the make/model/year of the spa you have.