Rear arch spats differences

So I'm selling some arch spats on eBay, and I've been asked if they fit a caddy? 

I thought they were all the same, never had a caddy, I've been told they're different. 

I had no idea they differed… can anyone tell me the differences?

Differences
Different
Differed


Thought I'd just say them all again, didn't think I said it enough the first time. 

they are different, caddy rear  arches are narrower than golfs