Stereo change, which adapter?

Hi all, would really like a stereo in my 94 Pre-Facelift which has USB mp3 functionality, been making do with an FM transmitter which has become seriously annoying cutting in and out when on rougher roads.

From cursory reading online it seems to fit a single din modern stereo I shall require an adaptor, has anyone here done such an upgrade before and do me the benefit of linking the adaptor they used?
 
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