You should be able to take your old ones into NAPA and you should be able to
get some plastic replacment ones.  I try to stock these all the time, but
lately I have had a run on them and I am out of stock until next week some
time.

Thanks,
Ken Wilford
John 3:16
www.vanagain.com
Phone: (856)-765-1583
Fax: (856)-327-2242