Changing belts on cec ql -7540 belt size question

Hi. I'm going to be changing the belts on my cec boombox. I know the size of the belts for the bottom tape deck which is 5 inches and 2 inches. I need the size of the larger belt for the top tape deck though. Anyone know what size belt it is? Thanks. View attachment 53002

 

@Mister X : can you move this one to the boombox section? Thanks!

 

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