530 and 550 actually.
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It would be nice to know what lengths they're supposed to be ( I couldn't find it in the manual), but Wipertech provides them as both 550mm and the ones I ordered from the UK from Wiper Blades Ltd were both 550mm, and all of their options:
Land Rover Discovery 2004 to 2016 Wiper Blades
show the front blades being an equal length, even where they're not 550mm.
Edit: BTW, I bought two sets (2 x 3 blades) of Bosch ARU22 from Wiper Blades UK and it worked out at $125 including shipping. Only hitch was that Australia Post took about 2 weeks to deliver them - Royal Post tracking showed when they were handed over to Auspost and they evidently then just sat in an Auspost warehouse waiting to be delivered.
I need to replace mine before we start getting more rain, i suppose if you got 2 @ 550 and trim one to suit ?
which side does the shorter one go ?
550’s fit both sides.
I have used Bosch and Wipertech.
Factory is 530/550. I have had 550/550 without issue.
My only thought is that it has a sweep that then double touches the rain sensor and changes how it reacts - nothing detrimental. It just gets wiped a bit more.