One only 16x3.25"

https://www.flat4.co.jp/products/detail.php?product_id=2627 

not sure where else you'll get one

I have one.... But it's different to that one.... I think it might be a bus one.
I'll rustle up a pic for ya.

Cool, you can email it to iiivvi@hotmail.com
And let me know if its 3.25" or 3.5"
Cheers