My old Craftsman Model 315.17380 is working great and in perfect condition. However, I’d like to find a plunger base that would fit it. Did Sears make a plunger base for this model? I did find a model 315.175320 PLUNGE BASE, would that fit my router? I think Ryobi probably made this router for Sears. Is there another brand that would fit it? Thanks in advance for the help.