The minimalistic red on the small seconds is matching your new strap. LF is a good watch too see.
When the straps are home, i post the results. Colour sheme is blue.
System of matching: I looked at the dial and i found a perfect strap at HS. The indexes match the stitches, the dial the leather. It was a longtime strap grail to order a Buffalo strap. My other Longines have the same subject, so it wil be a perfect matching pair. One target must be done and that is to find a stainless steel Longines pin buckle.