These are the chairs we have...
http://www.lanefurniture.com/Products/ProdInfoDet.asp?MasterNo=12690&LHF=

Their website isn't all that great. But if you click the 'click here' link at the end of the first paragraph on the page, there is a small graphic showing the size of 125" for the config you are talking about.

Here's the image from the link...


-Dave

M80s VP150 QS8s EP500s
ravenmanor.com/cinema/