There's plenty of 10cm custom fits available.
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I have just put a set of Kenwood KFC-101E speakers
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(eBay, 99 pence, brand new, job done) into the front of my MK1 and they're great.
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5 minute job, pop straight in, uses original grill and sound good.
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What's also nice is that they have an adaptor to use the original cabling, so no cutting the block off the end.
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I actually took a set of Pioneer custom fits out, which were also Toyota specific, as they had the socket for the Toyota speaker cable block on them already.
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I haven't driven the car for so long I'd forgotten the speakers didn't sound as bad as standard ones, but there you go, spare set of speakers.
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On your radio front, if you want to keep the standard radio, but update the insides, have a trawl through the classic car press.
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There's quite a big business in re-jigging old 50's car radios to FM sets, so I'm sure the addition of RDS is possible.
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Kelvin