where can i find the plastic connector for the vent pipes on a 1969 chevelle

I got mine from Ground Up http://www.ss396.com/mm5/merchant.mvc?Screen=CTGY&Store_Code=chevellecamino&Category_Code=VAPORRETURNVENTLINES&sort=&offset=10 These had another part installed in them that are not made. I used a small piece of small engine air filter foam.

I got one a few months ago from The Parts Place in Illinois. They were way cheaper than Ground Up on that particular part.