No disrespect to Autodoc and others, but they don't always get it right, and then posts on forums like this spread non quite correct info, citing AutoDoc as if it's gospel.
Best place by far to by any parts for the Panda is the independent Fiat parts specialist (and supporter of this forum), Shop4 Parts -
Parts for Fiat Panda IV (2012>), including brakes, suspension, lighting, engine oils, service items and much more...The UK's No.1 for Fiat Panda IV (2012>) parts.
www.shop4parts.co.uk
Shopp4Parts list the following info for the springs for a 1.3
diesel 4x4 Panda:
Front:
- AVAILABILITY: IN STOCK
- PART NUMBER: S4P27389
- OEM NUMBER: 51939621
- MANUFACTURER: SUPLEX
- RETAIL PRICE:
£116.47
- OUR PRICE: FROM £37.58 (£45.10 INC VAT)
Rear:
- AVAILABILITY: IN STOCK
- PART NUMBER: S4P46222
- OEM NUMBER: 52060107
- MANUFACTURER: SKF
- RETAIL PRICE:
£93.79
- OUR PRICE: £30.75 (£36.90 INC VAT)
Note also that they show a different front spring for the 4x4 diesel CROSS version - which suggests that there is a further difference there as well.
Follow this link to see the options -- remember these are for the DIESEL 4x4
www.shop4parts.co.uk
For completeness, this is the link for the springs on the 0.9 TWIN AIR 4x4
www.shop4parts.co.uk
Search that site and you'll get the answer for the shocks too...