OEM so it fits perfectly. has yours gotten smashed a thousand times when you mow too close to a telephone pole or tree? This is the exact replacement. For the price, it would be nice if they included a spring compressor since replacing the spring is a bit tricky.
In general, the website is very slick, diagrams nicely explode, popups verify the item has been added to your shopping cart, navigation is a dream and almost 'know' what you want to do next. The developers who coded this site need a pat on the back!