Where can I find a black locking gas cap

[H2 OBX]

I'm new to H2 ownership and after reading some of the posts here I think a locking gas cap might be a good investment. Anyone know where I can find a locking black gas cap. I would like to keep the original look to the vehicle if possible.

I have already spent about 4 hours looking online with no luck.

Any help would be great.

BTW, I like the community you have here. I'm just more of a lurker than poster.

2004 Pewter H2 Adventure with Navigation, air ride, brush guard with off road lights