How to get pri-microRNA sequence of plants - (Dec/02/2009 )

I have the sequences of pre-micro RNA of plants. But i need the pri-mirna sequence. I need to study the promoters of those miRNAs.

You may find useful this paper: Xie et al. 2005, Expression of Arabidopsis MIRNA genes. Plant Physisology 138, 2145-54.