This may have been covered before but i couldn't find any info via search:

Can the LS400 engine covers and other plastic cladding from the engine bay fit on our SC400s?

I'm mainly wanting the radiator cover and the main engine cover as show in these photos:

 

Yup the main cover fits, unsure about the radiator cover.

 

I dont think the radiator cover will work because its not a radiator cover. Its part of the intake system it looks like and if you notice the two brackets sticking out of the front, they look to be the brackets that hold the radiator in place.

 

the engine cover is on 94 or 95+ SC400s. My 96 has one. The radiator section is part of the intake

 

When you think of the word "engine" and things related.....

 

95+ cause my 94 doesn't have one

 

I think they can be fixed to the pre 94's if the mounting pieces aren't there you can take them off of the pre 94's. Radiator intake piece will NOT fit. Front end on the LS is different and the SC curves more. It would also hit the hood if you tried to mount it there.