double din radio in single din slot conversion parts needed?

[blakep82]

so, i start a new job in a few weeks, which involves 50 miles a day driving to and from work, my old B5 avant is getting a bit long in the tooth for it. time for something newer. I know what i want, i want an A4 Avant, 2.0tdi, 140bhp, under 100k, from around 2007, ideally with window tints already done just because, some fancy options fitted inside colour info screens etc bluetooth phone connection usb mp3 player, and hopefully a tow ball. and i want to spend £5k max. things come up at auction occasionally. missed the perfect car at auction because i just went to look and not to buy. it sold for £4650. nothing came up since.
theres one next week, has no options installed at all, not even the centre arm rest, its a 2006, but it has got 75k on it, which is good. and i need to buy soon, or i'll be stuck with nothing so im thinking, why not fit a few parts to make it nearer what i want since i'll be spending many hours in it. colour screen stereo, arm rest, window tints

i'm sorry if its been covered a million times, but i don't know the words to search for, i'm after a definitive list of parts needed to fit a double din stereo (aftermarket, not an audi one) into the single din space like this
28398
exactly like that in fact. so i know the climate control needs to move down to fit in the pocket below, i don't care if the ash tray doesn't open fully, i don't smoke, and i need a bracket and surround to fit the stereo (most likely an android system, with bluetooth, DVD, DAB, and maybe even freeview tv. just because)

who's got a list, and good suppliers? 2nd hand from breakers is always good, but what do i need to ask for? what are the parts called, or at least a picture?

thanks guys, i know you know your stuff

[NHN]

We supply/fit the oem systems if the service is of use, on if you would like prices for installs.

[blakep82]

Thank you! I think I've just sent you a pm (typed it out, pressed submit) but can't see anything in sent messages

[MrBigglesworth]

How about getting something like this: AVH-X7700BT 7" fold-out touchscreen multimedia player with easy smartphone connectivity via a simple USB cable supporting compatible applications, Bluetooth and a 13-band GEQ (1-DIN) - Pioneer Car AV Receiver (http://www.pioneer.eu/eur/products/25/109/281/AVH-X7700BT/page.html) fits in a single din and has a screen?

[blakep82]

well, thank you both for the replies, went to see the car at auction, it was a dog, and sold for £4600. i wouldn't have paid more than £3000 for it myself. it turned up on a dealers website yesterday for £6300 lol.
instead i found a 2005 S line, with RNS-E stereo with tv button, so can look at a DVD player and/or freeview tuner, 6 disc changer, bose speakers ,navigation disc included all pull up sun blinds, HID headlight, 2 tone leather seats, heated fronts, 93,000 miles, 2 litre TDI 140bhp, new MOT, service, the lot, £5700, so deal done today