Calling all Land Rover experts

[Oldmopars]

This year for the Cannonball build I am going to do a Land Rover S2A. I was born in 1970 and need to do a 70 for the build. From the research I hve done I need to do a S2A, but there seems to be a lot of variation on what they looked like.  It seems the steel grill was an S2A item, the plasitc S3, but I still see S2As with thhhe plastic grill. 

My biggest quandry is about the hood. I am finding 4 different styles of hood. 2 with the tire and 2 without. The difference between the 2, other than the tire mount is the front edge of the hood. One style looks like they just cut straight across and there is no lip, the other has a more rounded lip like the later S3. See the  pictures below. I chose both with the tire on thhe hood, bot are listed as a 1971 S2A. I know one is an 88 and the other is a 109, but its the hood that confuses me. Pleae help if you know the answer of what is going on with the hoods. 

I am using the Revell S3 as a start.