IOTA Circuit breaker Box

[DIVE2XS]

I have a iota circuit breaker Box in my 2003 Holiday Rambler presidential TT. I am looking to replace the single 20 amp breaker for a double 20th breaker.
I am looking for information on:
1. Where to find a manual on this circuit breaker Box.
2. Where to find a Double 20 amp breaker that will fit into the single breaker slot.
Thanks

[enblethen]

The breakers should be available at most big box hardware stores.
I believe you are asking for a "twin" breaker" Not a double pole.
Lowes 20 amp tandem breaker
Best converter