Hi Tom ,this has been covered a couple of times over the last 6 months or so ,am sure if you do a search shouldn,t be too hard to find , and as far as i know a later lid top half fits fine ,when i,v done it i,v had to let the vents in seperatly ( as they had already been cut out the other lid)
![Smiley](http://cal-look.no/lounge/Smileys/default/smiley.gif)
Cheers Dth