They do sound like an improvement over what I've got on the car now. I would guess the shipping cost is going to be higher than $3 so I'm willing to pay actual costs. Whatever it takes to wrap them in paper and box them well. Are you shipping UPS or USPS or another alternative?
If you are talking about the fine-mesh screen underneath the grills' rails, then I believe my '82 300D probably does have that fine-screen style. I'd like to get home and check that out to be sure.
Are you interested in PayPal? Money Order? Personal Check?
Western Union?
Ken300D