I've got a pair of closed back ones; used (and still in excellent condition) but the bolt pattern they offer doesn't quite work out for my desired position on my P5x. I can get you some pictures if you like on Friday (I'm slammed at work today). If you want pictures, send me a message with an email address.

Chris

This set just hit my eBay feed--I'd buy it myself but I just picked up a set on here a couple weeks ago.

https://www.ebay.com/itm/176264626001