In article , Jeff wrote:

Sorry I didn;t specify quantity, it's a small amount. And the specs
call for european beech specifically, american beech can't be
substituted.

I think I'd go back to the person who wrote the specs and ask why it's
important that the project use European beech. American beech is nearly
identical in appearance and physical properties, and I believe it would take
an expert to tell them apart. (Please note that I am not suggesting that you
should substitute American beech and tell your customer you used European
beech, but rather, that if the customer approves the use of American beech,
nobody *else* will ever know.)