If Lares has a rebuilt unit in stock, they sell it and you have to send a core or pay a core charge.

If Lares does not have one in stock, you have to send your "core" to get it rebuilt.

I have had to do each way described above (through Rockauto, which costs less for the rebuild and costs much less for the shipping).

I have posted this warning in other posts about Lares: do not buy a rebuilt 54/55 truck unit from Lares (or through Rockauto). Lares has a misconception about a 54/55 truck steering unit. Arrange to send your unit in for a rebuild.