SBR20 Mount Holes

Hello,

Can someone tell me the mount hole spacings for SBR20.

I am wanting to buy 2, SBR20 rails that are 1600mm long - however I cannot find a manufacturer that supplies the mount hole dimensions.

The smaller length rails typically have mount holes 20mm in from the end then have 150mm spacing. This does not add up for a length of 1600mm.

So.....what is the actual overall length of a 1600mm SBR20 rail - and the hole space pattern please.

Any help - very much appreciated.

Thankyou - Angus