I had a similar thing happen with my Stilo.
I went to remove the lardy cassette player and fit a Cd player bought from Aldi.
Problem I had wasn't the I.c.e. but the in dash surround it was supposed to slide from was buckled.
I never had any I.c.e. removals pins, so I stupidly use a long thin screwdriver, a bradawl and a cut down metal coat hanger.
It had worked on my Uno's and Puntos, and when I managed to remove the I C.E. surround.
The plastic surround that replaced the large hole that the dash (and the half sized Din) it got removed the same way, with my Heath Robinson removal tools, when I traded it in, and put the Fiat Cassette radio back in