XRAY - Model racing cars

I have just stripped the car down for a clean, and think its about time I need to replace most of the screws in my T1, they are all old and scratched and dont look very nice. Have seen set of screws. I can see that the small hex screws go into the bottom of the chassis up into the bulkheads and down into the bulkheads to hold the top deck on.

But what are the 3 phillips screws for (they look to be self tapping), I do not seem to remember haveing any self tapping screws in the T1, and definatly no phillips screws.

Could someone pelase tell me what these screws are for.

Thanks, James

The 3 phillips screws (selftaping) were used on the first T1 cars for the front body posts.