I had the same issue on my '04 D2. Went through www.roverparts.com. They were great and the kit for 2 front blades and the rear is only $40 with shipping.

 

I just got DI arms from a pull and pay. Fit no problem & easy to find blades. I did have to get a size 19 blade to keep the end of it on the windshield. The size 21 blade that the DII calls for is too long.

 

I have replaced just the rubber inserts with stock versions from Napa - they fit and work just fine. I have also found that Car Quest is able to order replacement units for both front and rear.

 

I picked up SilBlades from Expedition Exchange for the DII and have been quite happy so far... It's been well over two weeks and they still haven't needed replacing so I'm saving money already. All kidding aside they've been fine for prob a year and a half now.

 

I got my blades from OEMROVER off ebay which turned out to be Lucky8, it was $15 + shipping for two blades for stock Disco 2 arms. Not a bad deal at all and they work well. Got them just before that storm hit PA, and I am so glad I did.