Korg i1 refurbishing

Hi. I have a Korg i1 workstation that I purchased new in the 90’s. It is still going strong and sounds great but it is time to replace some worn parts. The battery is dead and the backlight needs replacing;I have a new backlight and battery ready to install. The key felts are worn out and the keys are “clacky”. I can’t find the exact felts for the i1, so I am consider using felts from a different keyboard. Does anyone have any suggestions? Thanks.