the ur5e plate is thicker than the assembly we ordered

Revision J, showing the complete tool and nest relationship. Their delivered plate drawing has a different reference, not merely another issue of J

Ask the technical contact to compare that complete assembly and explain the package suffix separately. A plate difference may be obvious while the label change has a different cause; I wouldn't merge the two into one assumption.

Sent J and both delivered identities. Installer marked the changed tool position and the nest approach it affects. No request for anyone to fit it and see

Can they supply the agreed plate instead?

Ask that now, HenryBarnes. A comparison can be useful without committing you to redesign around their substitute. We inherited a supposedly interchangeable tray that fitted the same shelf beautifully and the fixture badly; nobody had kept the original option in the conversation.

Chen, agreed. The installer can identify consequences while purchasing asks for the agreed part. Those are parallel questions, not permission to charge Henry for adapting the tooling.

Technical contact says the suffix identifies their package grouping; they supplied the corresponding component list for our installer. They also admit the plate substitution wasn't compared against J. Original plate is available

Has the installer matched the component identities to that explanation, rather than just the new package name?

Yes, component identities checked. The unexplained label issue is closed. We requested the original plate, with its J assembly reference confirmed before dispatch

Good. Any dispatch evidence yet?

Carrier collection confirmed against the replacement plate mark. Seller agreed the substitute return separately; we're not treating the new parcel as arrived yet

Replacement received and installer checked its identity and dimensions against the agreed assembly. The plate mismatch is closed; full tooling installation and commissioning remain their next work, not a result I'm claiming from the parcel

Does the retained assembly pack now identify the actual supplied plate and component list? That would stop the substitution drawing being mistaken for the installed reference later.

It does. Installer retained J with the replacement identity and confirmed component list. Thanks, HenryBrooks, asking for the original plate kept this from turning into our redesign bill