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Easy to replace. What's your hang up ??
use PB Blaster or Kroll or other penetrating oils mentioned in this forum instead of WD40. WD40 is good for a lot of things but it's not great penetrating oil.
I am not there to see the problem if there is one.-----But you asked.---------Drill the heads off the bolts.----Remove outer cover.-----Pry out the mount.-------Use heat to try and remove the studs.------.----Make drill guide from steel plate if need be to drill out stubborn bolts.-----Make / find new studs and use nuts when re-assembling.----Will make next time easier.----The motor is 12 years old, so what other maintenance has been done or are you planning to do.------There are steps to take to make bolts easier to remove around the corrosion plague !