Hello - I am probably an idiot, but I'm having trouble finding replacement filters for my hot tub (Marquis Celebrity Elite Woodstock). I would be happy to buy the Marquis version of the filter online but I'm not seeing that anywhere (even when I type in the model number). I purchased some filters that were 50 sq ft for Marquis spas (new style) and Cal Spas with dimensions OD: 5-3/16", Length 12 1/2" but this is smaller than the Marquis filter it came with. Can this still be used as a replacement or is there a website I can buy a filter directly from Marquis. Sorry for the dumb question!