Philip, yes the D number is just a revision of the eariler B number.  You can
use it with no problem.  You can't buy the B number any more.  The D has
superceded it so now if you ordered the B number from the dealer they would
send you the D.  I have put these in customer's vans and sold them with no
problems.

Thanks,
Ken Wilford
John 3:16
http://www.vanagain.com
Phone: (856)-327-4936
Fax: (856)-327-2242