This maybe my only option as no one can identify the beast.You should be able to take the blade measurements and find a similar blade to install. Basically all you need is the amount of drop in the blade and the length of the blade from the center of the hole and the size of the hole. New bolts is a good idea but I usually just install them 180 degrees from original so that there is a new surface to wear on. That is if the bolts aren't totally worn out to begin with. If that's the case then install new bolts.