[vectorit]

There are a couple vendors here that specialize in clips, but it has been my experience that the OE trim clips like yours and the ones for 67-68 lower trim are not reproduced...

If I were you, find one of the original clips and take a few pictures of it from different angles with a ruler next to it. You may luck out, and one of the vendors may have a stash they'd be willing to sell.

Also, be very wary of places selling your needed fastener. Order one or two, and then see if it works. If it does, order all you need.
In my case with the 67-68 lower trim, there are few catalog versions for sale but they do not work. Plus they are expensive.