Replacement for ECM-HQp1 mic on HC-1

I have the sony HC-1 and would like to add a mic - wide stero mode - HQP1. Unforunatley I can't seem to find it anywhere. Does anyone know of a replacement for this model. I've found the HST1 but it appears it's only high fidelity. Wasn't sure if another manufactuer made one that would be compatible with teh hc-1

thx in advance