Removing range rover wiper arms

Today i stepped into my local halfords to pick up a haynes manual for a range rover, i didnt see one on the shelf which i found a bit odd.
So i asked the dude there, he looked through a book and found they didnt make one for my 88 V8?

I was like eh ?

All I want to do is remove the windscreen wiper arms and replace with the ones ive got her, although the ones ive got on ebay are the arm with a while at the bottom, that has a shield over it, pop it out and hey just wack on and screw in the bolt, but the ones on MY actual range rover are just the arms and i cant see anywhere visibly to remove them?

How do i get em off, is there a HOW TO anywhere, and have i purchased the incorrect range rover wiper arms because i thought for the classics they were all the same ?

Thanks

not really sure about your 1988 model yr, but on my 78 model, think the arm came off with a bit of very careful prising with a screwdriver.
just prise the arm off the wiper drive stub very gently and slowly. put some protection under the screwdriver blade.
ie hardboard or a cloth?

Paddock Spares have a Haynes for the 86 to 92 Clasics.

An excellent place to get info btw. I have also found a bloke on eBay who specialises in parts for the LWB LSE's