gp39/CD40L/CD154 cDNA clone

[JLaning at organo.com]

     I am interested in preparing a gp39IgFc fusion protein to look at 
     signaling through CD40 on keratinocytes.  Can anyone lead me in the 
     right direction as to who would have this cDNA clone available or 
     where I might procure the clone aside from starting from scratch.  
     Thank you in advance.