Go to a company that cuts glass for windows. Ask to them if they can cut tempered heat resistant glass like they use in fireplace doors into that small of a circle. Then you need to find that glass or ask if them if they can source it.
I can't seem to find a picture of your furnace and I haven't worked one like that before, but a type of silaca sight glass is used often on some appliances. It looks like plastic, until you touch it. Popular on Engineered-Air units. It might be easier to find if your current sight glass (or hole) is small enough.
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