В дополнение к первому посту на одном из английских сайтов нашел список переходников, он частично совпадает у приведенными, но есть и отличия. Все указано для Astra G 1998-04.
AlpineТолько кнопки на рулеPart No: KCE-870B(R15) (Interface) (2003 and 2004 range)
KWE-871E (Cable for interface)
Price: Interface - £47.99 Cable - £13.00
Compatibility: Alpine stereos that are steering wheel remote ready
Кнопки на руле и дисплейPart No: KCE-970B (Interface)
KWE-971E (up to 06/2000) or KWE-972E (from 07/2000)
Price: £89.99 (for interface and cable)
Compatibility: Alpine stereos that are display and steering wheel remote ready .
BeckerТолько кнопки на рулеSoundlinxPart No: BEC01VAU
Price: 110.99
Compatibility: All Models to Becker Traffic/Online/Mexico Pro & JVC KD-NXIR or Sony MEX-100NV; Head unit may require software upgrade.
BlaupunktТолько кнопки на рулеPart No: 7 607 621 143
Price: £47.99
Compatibility: All with OEM remote out.
Кнопки на руле и дисплейPart No: 7 607 588 510
Price: £49.99
Compatibility: Acapulco CD51, Acapulco MP52, Alaska DJ52, Daytona MP53, Bremen CD72, Casablanca CD52, Heidelberg CD52, Los Angeles MP72, Madrid C72, Miami CD72, Nevada DJ72, Orlando CD72, San Francisco CD72, Seattle CD72, Toronto MP73
ClarionТолько кнопки на рулеOlder (2003) models
Part No: CLA-V2 and CLA-09OP
These interfaces work by changing the hard wired line into an infra-red signal which is received by the IR receiver of the head-unit.
Price: CLA-V2: £53.99 and CLA-09OP £11.49
Compatibility: Most models
Newer (2004) models
2 types exsist: Hardwired and infra-red
Part No(Interface): RCE-103W (hard-wired) or RCE-103F (Infra Red)
Part No(Harness): CCE-109
Price: For the Harness and Interface £30 - £50
Compatibility: All models except AB243R/RG, DB248R/RB and DB148R
JVCТолько кнопки на рулеPart No: JVC01VAU
Price: Approx £49.99
Compatibility: All Models to JVC Radios With 3.5mm Steering Wheel Input.
KenwoodТолько кнопки на рулеPart No: CK-R70EU
Price: Approx. £25 to £40
Compatibility: KCD-M4524/G, KDC-5024, KDC-6021, KDC-6024, KDC-M6021/G, KDC-M6024/G, KDC-MV6521, KDC-V6524, KDC-7024, KDC-M7024, KDC-8021, KDC-8024, KDC-M9021, KDC-PSW9524, Z638, Z838W, KRC-594, KRC-694, X838
Кнопки на руле и дисплейPart No: KPA-SD100
Price: Approx £70 to £100
Compatibility: KDC-V7521, KDC-B7021, KDC-7021, KDC-5090B, KDC-PS9590R, KMD-PS971R, KRC-PS979R, Z-828, KDC-9090R, KDC-8090R, KDC-MP6090R, KDC-7090R, KDC-6090R, KDC-5090R, KRC-V791, KRC-791, KRC-779R, KRC-V879R, KRC-V679R, KDC-8080R, KDC-7080R / RV, KDC-6080R / RV, KDC-5080R, KRC-878R, KRC-778R / RV, KRC-678R / RV, KRC-578R
Part No: CAW-OP706
Price: Approx £25 to £50
Compatibility: Z-838W, Z-638, KDC-PSW9521, KDC-M9021, KDC-8021, KDC-MV6521, KDC-M6021G, KDC-M6021, KDC-6021
PanasonicТолько кнопки на рулеPart No: AD 9-7001
Price: To be confirmed
Compatibility: all Models with remote input
PioneerТолько кнопки на рулеPart No: CA-R-PI.151 (Hardwired remote, not infra red)
CD-RA201+ (Infra red, this requires a harness adapter
CD-RA201OP)
Price: CA-R-PI.151 - £39.99 Infra red (above £100)
Compatibility: All models that support Remote out
SonyТолько кнопки на рулеPart No: Interface PC99-X06
Harness PC99-SON
Price: Interface - £32.99 Harness- £6.99
Compatibility: All models that support Remote out
Кнопки на руле и дисплейPart No: CTDOPS004
Price: £75.99
Compatibility: Any Kenwood headunit with OEM display out
Part No: VAU01DIS
Price: £79.99
Compatibility: All models that support Remote out (CD changer and joystick remote)
VDOТолько кнопки на рулеPart No: VX Remote 1
Price: £10.00
Compatibility: Models CR 231, CR 551X, CD 421 and P 6441.
Part No: VX Remote 2
Price: £10.00
Compatibility: Models CR 2502, CD 3200, CD 4802 and CD 2502
Может кому пригодиться, все претензии и замечания - к англичанам

У меня вопрос.
Кто-то использовал переходник CAW-OP706 для Kenwood, с какой моделью и какие результаты?