The smaller one is for the engine lid and the larger one for the front hood. I bought these for my RSR replica. Very nice quality and you can't beat the price (less than a 1/3 of what the speed shops want). They are a bit high on their shipping cost - close to $10 to ship 4). You might want to buy a couple of the smaller ones as spares since the rubber portion can (and does) break after a while.
Here's a hsot of the larger ones on my hood. I haven't gotten around to mounting the ones on the engine lid - holiday vacation project.
