RV14 drawing 49 shows the firewall mounted oil cooler and attaching hardware.
The link below should get you to the download site at Vans aircraft.com for the drawing.
https://www.vansaircraft.com/wp-cont...1/RV-14_49.pdf
I think the Show Planes oil cooler mount is a better option for the 7. A friend of mine copied the RV14 install on his RV7A and it was pretty cramped and crowded in that area.