Best of luck with search , have a look in all Mx5 forums there is lots on Facebook, there is uk plus worldwide forums too , I am sure someone will know 
There is Mx5 life , Mx5 forum , miata owners Mx5 nutzs , mk1 owners , Mx5 dogs , just type in Mx5 groups in search join groups , also Mx5 buy and sell may be listed who knows , let us know if you find your old 5