CyberGreg is correct in that any DIN-mount radio will physically fit the opening.

As for the wiring, please not the splices in the .pdf CG attached. You will note that there are only FOUR wires shown between radio and amp, with splices to break out radio's front channel to both front & rear amp inputs. That is because, as I mentioned in first post, that the amp is capable of both fron AND read inputs, but is crippled by the Becker only having front's out (please note lack of " FADER" in Becker. So, if you want to take advantage of the amp's capabilities to control Subwoofers as a rear channel (The becker is the first radio i've seen in 20 years with no rear channel/fader!), then you can (but'cha don't have'ta) root down the splices and rewire it as front/rear.

Also, as I noted, page 8W-47-5 of the Tech Authority wiring diagram is WRONg-0; The list the amp to wiring as "speaker Wriing Supply Voltage & Ground", when it is in reality a dual-coil Sub and each speaker has a pair of + & - terminals.........'Ave Fun!