Early Lwts had swb rims (5J) with 6 or 6.5 x 16 tyres. Later ones had lwb (5.5J) rims with 7.5 x 16 tyres. Often swapped for 205/16 radials as they are broader, quieter and easier to source. Wolf rims and modular all fit and are wider if you want bigger/wider tyres.
A guy at Manby LR show brought a new vent panel over to the LWt club stand. It looked good. HAve a look on lwt forum/Events/Manby. There are some snaps. Goole Surplus was the compnay I think. Circa £300.
Neal