What are the sizes of the wheel mainly shaft size I’m after a wheel that’s 140 mm with 15 mm shaft

Looking at the belle diagrams you require the below. 19.0.603 - Wheel 160 Dia x 20 Bore / 60 Hub https://www.lsengineers.co.uk/catalog/product/view/id/9355 I've listed the drawings for your machine. https://www.lsengineers.co.uk/belle-pcx-12-36-13-40-plate-compactor-spares.html