Will this work for a 2018 cat 259

If you have a Cat 259D series, it will work.

do you have the wiring harness for a top cat–ARGOTK Model BDRC-48

It's all covered in the FAQ.

CLICK HERE

HAVE A CUSTOMER WITH A NEW HOLAND C232 SKID STEER LOOKING TO PUT A MCLAREN 6 WAY DOZER BLADE ON IS THIS WHAT WE NEED TO BUY TO HOOK IT UP AND IS THERE ANY OTHER PARTS NEED TO HOOK IT UP TO THAT SKID?

This is all that you need.

What is the lead time on these?

IN STOCK.