Serpentine/Drive belt specs required pls

[Almo]

Hi guys, I'm at the end of day one of a 3000km road trip and my drive belt has started squealing.
Thinking it does not have enough tension on it maybe or it's getting worn?
It's dark out now but I will try and get a good look at it in the morn and will try some belt spray and see if that helps but I'm thinking that is a bandaid fix.
I will be passing through some good size towns tomorrow so have a chance to buy a spare.
I need the width and especially the length. Rib count too.
It's for a 2007 1.8TDCi with NO air con.

Any help really appreciated. I'm in NZ so going to bed now and will check for replys in morn.
PS. This vehicle is an import here so can't get parts from Ford dealer.

[Almo]

The answer is 1460mm long, 20mm wide with 6 ribs.
I had to replace it on route today as the belt grip spray only worked for so long.
The new belt is about 1/2" shorter than the old one but I'm guessing the issue is that the spring in the auto tensioner has lost its spring?
Any one more learned than myself got any thoughts or experience of this?