DM: do you have pictures of your vise's handle cause i can't see in my mind what an oblong handle might look like? i bet Kevin's handles are great and maybe they are better material, but some vises engineering had the vise handles a certain length and type of material so the vise handle would bend before breaking the vise.
if you decide not to buy a new handle some members just put their vise handles in a press or even take it out of the vise and beat on it with a hammer to get it back to straight. depends on your budget and how you want your vise to look.
thanks for the pictures if you have time to take and post up a few