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most are standard fit ie,400x400.there are about three sizes you can buy..

http://www.ukcampsite.co.uk/redirect.asp?redir=http://www.towsure.com/search/roof+light/page+5

MPK Rooflight 400 x 400

MPK Rooflight 400 x 400 with Flyscreen

for spares ask here.

http://www.caravanbreakers.net/

Mine was the same  - I had to replace the whole thing.

Cost me £46 off ebay and really easy to replace. A 400 by 400 MPK complete with flyscreen and blind.

Just make sure that you get some Butyl Tape for sealing it on the top of the van.  I got that off ebay for £5 including P + P

Do not use silicone for sealing it though.

Took about half hour to replace.

We never done one before either!

use W4 mastic on a roll for sealing them to the roof and bend down the lip of the mastic inside, also clean the van roof properly with white spirit

because i am as agile as a elephant with athritis I had to pay a mobile bert £30 to reseal mine but he did a proper job

These roof vents were made by 'Hartal' which are 40 x 40 cms. However, they are quite difficult to obtain now as I needed two replacements myself due both being broken but as the caravan was under warranty they were replaced with two different style units. Some companies still have surplus stock but it's finding them is the problem but you do have to replace the whole unit as the handles are not removable. This is the type you need.

http://www.ebay.co.uk/itm/CARAVAN-MOTORHOME-HARTAL-ROOF-VENT-40CM-BLIND-/260772685717 

http://www.leisureshopdirect.com/caravan/ventilation/product_32086/hartal_400_caravan_rooflight.aspx