If you need to mail order I am quite sure that the one from campingworld at 29 1/2" is the right one, although I admit I have not seen it in person.
Originally Posted by L Brown
Thanks for all the great advice. I've done careful measurements of the existing anchors on the tabletop and floor (looks like original equipment; floor anchor is the recessed style) and will try to find a store in the LA area that carries this so I can go in and compare -- it looks like about 2 1/8". Or else, I'll try mail order and take my chances. Luckily the part is not too pricey