I have a vs Super Mario Bros cabinet and want to replace the original 16 cm speaker (she's not working so well :-( ). Since 16cm is 6.3" and Happ and other sites only seem to stock 6" and 6.5" speakers.... has anyone replaced one on there's and if so, whats the best fit? I'm trying not to put any holes in it since its all original (except now the speaker).