Omega made a blue rubber white stitching strap in 18mm with straight lug ends for a 16mm deployant clasp. Reference number 98000209 and the long version is 98000209L
I bought one of OFrei some years back but moved it on together with the watch it was bought for. OFrei still has the long version for sale.
Try Google pictures and I 'm sure some 'll come up.
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