There's plenty of 10cm custom fits available.

I have just put a set of Kenwood KFC-101E speakers

(eBay, 99 pence, brand new, job done) into the front of my MK1 and they're great.

5 minute job, pop straight in, uses original grill and sound good.

What's also nice is that they have an adaptor to use the original cabling, so no cutting the block off the end.

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.

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.

On your radio front, if you want to keep the standard radio, but update the insides, have a trawl through the classic car press.

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.

Kelvin