I love my KA-7100 - I have it paired with the KT-7500 and both have handles. It really dresses them up for sure. vintageboy is right - the D-7 handles come up on ebay every once in a while, though often they're just listed as Kenwood rack handles because many don't know the model #. It's always best to ask the seller for measurements though just to be sure.
As for the 7100 itself, I really enjoy it as an amp - not top of the line, but still has some nice features and tone control. It's probably my favorite volume knob of any piece I've owned - the tinted mirror backdrop and the smooth detents (not such a harsh click) when you turn it - I'm a fan.