The bottom hole size:10x6.2 cm,pls made sure your original antenna base size less than it,otherwise,it can't be install. If you want other color,please choose "Multicolor" and leave message.otherwise,we will sent the black color. Package inclued: Back shark fin 1 piece PET-S antenna 1 piece Copper screw and nut 1 pair 3M sticker 1 piece Product Features: 22 colors ABS plastic Piano paint Instead original radio antenna Easy to install Little curve bottom Size:length 16.9cm,width 7.7cm,height 6.3cm. Installation method: 1,3m adhesive stick on the bottom of shark 2,Counterclockwise rotation,remove the original antenna,clear around the base,keep dry. 3,Tighten screws on the original antenna base. 4,Alignment position(very important),puts pressure shark mounted on the roof 2 minute. FAQ: 1,The car due to long-term exposure to outdoor,erosion by rain and snow,the color has changed,so maybe have little different color with shark. 2,The bottom is Curve,if your roof is flat,there have a gap,but does not affect the use.