Urgent Book Cover Spine Correction on a supertight budget

I need the spine of an already-designed paperback cover resized right away. The current file fails print checks because both its width and height are off, but I have the exact millimetre measurements the printer requires.

You’ll receive:
• the layered cover file (PDF/PSD/AI—whatever you prefer)
• my precise spine specs and bleed guidelines

I simply need you to adjust the spine area so the full wrap meets those numbers, keep all artwork centred, export a press-ready PDF, and return the updated source file. Once your version matches the measurements and previews correctly in my printer’s template, we’re done. Speed is crucial and the budget is lean, so clear communication and a quick turnaround will be appreciated.