Thanks for the comments and tips. Just call Ed at Kundensport and place your order. I saw his concept on the 911 ST, white in color where he used them on the 1969-71 MFI stacks. I asked for a base that fit the 72-73 stacks and Ed created them. All I had to remove was the rubber seal in the tops of the stacks to allow the base to fit in and clamp down using the stock clips. Drove the car up to Hershey and showed them to the Pelican Parts gang that linked-up at the crab shack. I must find a filter similar shape to the K&N, but rather have paper like the standard Frame and toss away every year.
I'll remove them and take photos of the base and inside.
Vr,
Scott