Have you got a link to these blinds please ?
Here you go...
You can request a custom size if you order the standard size which is one-up (e.g. for a 95 cm wide custom blind order the one which is 100 cm wide). We ordered the kitchen one first, then the bench seat one a couple of months later when the kitchen proof of principle was a success. Note that the drop-down menu on eBay is for
blind size not
overall unit size (the frame adds 8 cm to the blind size,
i.e. 4 cm each side). So my measurements were:
Kitchen
Overall size required (given to seller in order comments): 75 cm x 44 cm
So
blind size required (overall size minus 8 cm each dimension): 67 cm x 36 cm
Therefore next standard
blind size up (to choose in the drop-down when you order): 80 cm x 65 cm
Bench Seat
Overall size required (given to seller in order comments): 100.5 cm x 52.5 cm
So
blind size required (overall size minus 8 cm each dimension): 92.5 cm x 44.5 cm
Therefore next standard
blind size up (to choose in the drop-down when you order): 100 cm x 50 cm
If you order them now, then the first and last line of each should be what's needed. You'll want to double-check those measurements first though!
I removed the curtain rails then used double-sided tape and bits of cardboard to work out where I thought the blind should go. It was easier once we had the kitchen one because I could use that to make a template of the correct curve radius when working out the bench seat dimensions.