Can I install a 2003 town car hood and front lights into a 1999 model,

I dont think so, there was a design change in 2000

Can i put 2003 Lincoln town car hood and fenders on a 2001

I think you would have to replace it with the whole front end.the fenders too.

Yu have to get the top half of a 2003 radiator support and weld it to the bottom half from your 99 I just did it to my 98 and yu have to get headlights finders and bumpers from the 2003 if yu want it to work