Help identifying vintage resistors wattage rating.

How "old" is "old"? That looks like the construction of early metal film or metal foil precision resistors from the 1950's or 60's. Despite their size, power ratings weren't very high so your unit may be only 1/2W or 1W. (Being precision parts it could be that power rating was based more on resistance tempco due to self heating, rather than the power that would cause permanent damage.)

I have to agree with the other comment: Visual appearance doesn't suggest replacement is necessary. Except you may have already clipped the leads too short.