HELP 71 Scamp

Hey guys I am the newbie so here go my dumb questions. I have a Plymouth Scamp. I have had this car since I was 14 I am now 38. It has been painted twice by me and my dad. Great family project but money was tight so you figure it out. My question is does anyone know a good way to patch the roof where it joins at the body. The car originallly had avinyl top and it seems that there seems to be a lot more filler than I remember. Any clues? Next queststion I have to replace my door jambs the strikers have fallen out. AMD says they sell door jambs but which is the best one to use for a scamp any help would be appreciated. Just get ready for more newbie questions