The Infinity cam was optional in 2001 and 2002, so it could very well have the standard BT cam w/o adjustable let off.

The 2000 model didn' t have a W/C string and cable or sand trap limb pockets, but the ES has had them simce then.

There is a small difference between the 2001 and 2002 Extreme Solo. The axle to axle on a 2001 was 36" with brace options of 5.65" and 6.65"

The 2002 ES has a 35" axle to axle with brace opitons of 6" or 7" .