i don't know about everbody else but on my 98 svt,all i had to do was to remove the rubber insert from my drivers side cupholder...underneath the rubber insert the space is wider and deeper,and it is tapered...its fits everything i've put in it perfectly...it holds a can perfectly,and all the fastfood cups(including supersize)fit just fine too...it holds them securely..
the passenger side is different under the insert,it is just flat and as useless as with the insert in it...
just pull your drivers side insert out and see if it is like mine,if so you will not need to waste your money on that cup holder insert...easy and free fix...the insert can be put back in for aesthetic purposes,but mine seems to always stay in the trunk...