The manual posted by Cherryville Chuck is dated 1996.
Might be worthwhile to bring the table top to a local Sears store to determine which -- if any -- of the current Sears routers fit.
As an aside, that router table reminds me of a one sold by Porter-Cable in the early 1990's .Had one and found it to be very light. I tightened the router mounting screws before turning on as it vibrated a great deal. Also mounted it to a piece of 3/4" plyw'd. for ease in clamping it to the bench/work table.
If you plan on using this router and table a lot, you may want start with newer products,you could end up with a lot money of spend and not be very happy.
If it for occasionally use then you may want to buy used and make it fit
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