Re: Looking for technical data on a Sage 503L and 504L reels
When an internet search comes up dry the only way I can think of is to put these items on a 'watch list' on the auction site and when they come available contact the seller and ask the weight. Once you establish that the reel is the right weight and condition you can be the buyer. In the meantime I would take the rod and using your own reels and those of any fishing friends try to establish what will provide the weight you want. If the reel has line on board you can string it up and see how the whole thing feels. This all hinges on being able to determine the 'dry weight' of the test reels so you can find the proper Sage on sale.
The exit strategy would be a mint CFO in proper size. It appears that they are more available and in a pinch a nice old CFO makes a good match to darn near any rod.