From memory Harlem Globe Trotters has the same speaker as Playboy right? See the dimensions here:
https://pinside.com/pinball/forum/topic/new-6-inch-speakers-found/page/2#post-5817567
Size wise these 5" speakers look like drop in replacements:
https://www.newark.com/mcm-audio-select/55-1595/audio-visual-audio-video-loudspeaker/dp/11C1076
https://www.newark.com/mcm-audio-select/55-1870/woofer-5-aluminium-cone/dp/39C2182
Note the sound boards in these games are not hi-fi.