For years my car's had the stock 5 teeth. I recently got an extra center bar with all 5 teeth. I was going to just replace my 5 teeth but think instead I'll just add to my stock setup. I know it'll be easier just to add 4 now (add one in between every current tooth) but if I eventually go up to 15, how does it work then? Trying imagine it before I drill anything. Measure twice, cut once! Just trying to make it easier on myself down the road! Any thoughts appreciated, thanks!