Hard to find an original one that is not cracked. They do re pop them for about $250 to $300 for chevelle's and Camaro's etc. You would just have to find a maple leaf centre button.
The 69 and 70 shared the same wheel, 69-70 full size Chev and Pontiac, 69-70 Chevelle, 69 Camaro, 69 Beaumont, 70 Monte Carlo, 69-70 Nova and Acadian. Heres some pix I posted a couple of years back on Poncho of the variety of centre caps but these have the '69 Beaumont medallion (which we have in stock) Cheers.