Thinking of adding 8-lug wheels to my 1961 Bonnevile convertible.  Are there any aftermarket manufacturers?  I know there is a year cutoff as to what will fit what if I find them used.  Does anyone know the year of the change for the design?  

I've been researching the 8-lugs myself for the past 2 months, as i intend to put a set on my '65 Catalina 2+2. It appears that the 60-63 wheels are different in several aspects from the 64-68's. The earlier ears have narrower brake shoes, so the earlier hubs don't fit. Not sure if you can put the later hubs on your '61.
As for reproductions, check out http://www.arrowheadcomponentsinc.com/home.html. They are doing the front hubs only so far. Don't think anyone else has attempted 8-lug repro's. Good luck.  

Hi if you’re looking for 8 Lug wheels and drums that have fins with no nicks or dings, a mirror finish, turned drums, powder-coated wheels, new lug nuts, chased studs, basically a fully restored set of Drums and Wheels for your 1960-1968 Pontiac then go to Chief8Lug.com.  We offer restoration services for your 8 Lug Wheels and drums and we also sell complete sets for those who do not have any cores available. Check out our website or contact us at (310) 832 8336 or by email chief8lug@hotmail.com
Thanks – C8L  

Here's a picture of what we produce!