Seat section of Comfort Seats are too short!

[z356]

Has anyone come up with an add-on leg extension to the regular or Comfort seat portion (standard 19",approx.) in order to provide more support for thighs? I just took delivery of '06 X5 with Comfort Seats and on longer trips the seat part (not the back, which is great) is not supportive enough, even though I am only 5' 7'' and do not have extra long legs. Because of back problems, I thought the Comfort seats would be superior to the Sport seats with the built-in extensions, but I might have made a big mistake after experiencing my first long 5 hour trip on the SAV! The Comfort Seats on my 2004 745 have a different seat part, which has extensions and more thigh support. But the X5 version is different and lack these features. If anyone has an innovative suggestion or seen an aftermarket product that could help, I would appreciate hearing from you.