Here is what I finally broke down and used and they work great.http://www.amazon.com/Zodiac-5820-White-Unibridge-Replacement/dp/B002SG7NQI/ref=sr_1_1?ie=UTF8&qid=1441131483&sr=8-1&keywords=polaris+main+drain+cover
I too tried those clips and the only thing that worked was to cut a short piece...