Best speaker replacement

[PRminitrucker]

Hey dabears I was just thinking the same thing . I tried to make a dog house to fit over the speaker but it didn't work out , so I mounted it behind the seats in the cab but it looks crappie though. I remember in my train days a guy at the club I was in said to check out a site called tonys train exchange for g scale sound modules and speakers , well I went to the site and they have a oval one that's shorter but has 8 ohms impendce and my mfu one says 4. I have no idea if I could adapt it to the Mfu . Does anybody know if this can be done?