1971 MTD columbia 361-520 seat

Mini Bike & Go-Kart Parts

Hello, looking for a seat for my 71 columbia bike. There was a seat on it when I bought it but it's incorrect. Picture shows bike and incorrect seat. IMG_20201019_122659042_HDR.jpg IMG_20201018_190246490.jpg
I have the hard tail version of that mini..... it has the original seat on it... very poor condition...as you can see sides were black, but the top was sort of a glitter light gold...
Would you mind sending me the dimensions of that seat? Trying to stay as original as I can. Also where can I find that exhaust extension?