Personally, I'm not a big fan of plastic fuel cells, although they have some advantages. For example, it's easier to change the fittings if another size is needed.
It's hard to keep them sealed up. I've had to resort to making sealing rings from a different material, and using some sort of sealant as well.
There are nice low cost aluminum cells such as this one, also available from Summit.
http://www.summitracing.com/parts/sum-291203/overview/JAZ and RCI make nice cells too.