Hardwood Shims or Spacers

[Jonny A]

I'm re-assembling my cockpit grating, and in addition I need to replace the hardwood spacers or shims it was sitting on, some of which have gone missing. I simply can't find what I need online - there are plenty of softwood offcuts but nothing in iroko or teak. In fact, ideally I'd want simple rectangular pieces, about 5mm deep, rather than wedge shapes. Any suggestions for where I could get these..?
Thanks.

 

[Poignard]

Either make them or buy teak lippings from somewhere like Robbins Timber Ltd and cut off pieces to length.