Head harness posture collar

Has anyone used one of the posture collars with the head harness that attaches to the collar and crosses over the head?

I was wondering if there was space to also wear a ball gag as the collar comes up over the mouth.

I love the look of the collar but would also want to be able to wear a gag too.

I have seen a number of variations of posture collars. There are some that do not come up over the mouth which allow the use of a gag as desired.

Thanks for your reply kinkycouple.

I know the ones you mean. If could jab them all I would!

I have a very specific one in mind though. The look of the straps that go over the head makes it incredibly strict. I might buy it and adapt it so that a gag can be fitted. Maybe cutting a small hole so that an inflatable gag can be fitted.

Could you post some picture of the harness, please??

Http://m.ebay.co.uk/itm/360470959023

This is the only picture I can find. They only seem to be available on eBay.