vans that came with alloys had a slightly bigger clamshell.
 
 
 
In a message dated 4/20/2015 2:49:57 P.M. Eastern Daylight Time,  
stuartmacm@gmail.com writes:

I  replaced my ‘87’s steel wheels with alloys, and 205 doesn’t fit.  Only 
at  about 20 PSI will it fit.  
The  later 205 clamshell has an extended attaching lip about an inch longer 
than  mine, so are you saying that if the van came from the factory with 
alloys and  185 tires it has the modified clamshell?  Or did all Vanagons that 
came  with alloy wheels have 205s and the bigger clamshell?  
Inquiring  minds want to know! 
Stuart