Fins for This Board

I am a longboarder, but picked a up a shorter board at a garage sale, just to try out short board surfing.

This is what the bottom looks like:

I want to get some cheap fins for it. I may decide that short boarding isn't for me, so I don't want to waste any money.
Can I assume that any FSA fins will fit this (such as those below)? Each slot is 1/4 inch by 7/8 inch, and are 1 1/4 inch apart.
http://www.amazon.com/DORSAL-THRUSTER-SERIES-SURFBOARD-FILLED/dp/B004LOJ5S4/ref=sr_1_1?ie=UTF8&qid=1372546553&sr=8-1&keywords=surfboard+fins+thruster)?
Thanks,
Al

This is what the bottom looks like:

I want to get some cheap fins for it. I may decide that short boarding isn't for me, so I don't want to waste any money.
Can I assume that any FSA fins will fit this (such as those below)? Each slot is 1/4 inch by 7/8 inch, and are 1 1/4 inch apart.
http://www.amazon.com/DORSAL-THRUSTER-SERIES-SURFBOARD-FILLED/dp/B004LOJ5S4/ref=sr_1_1?ie=UTF8&qid=1372546553&sr=8-1&keywords=surfboard+fins+thruster)?
Thanks,
Al