Buy a Mark II clip. Disassemble the clip. Switch the pin that fits through the plastic block used to pull the slide down from the left side to the right side.
You have to take the pin out to disassemble the clip anyhow.
Examine the clip...closely. Now realize the clip is cut out for the pinhead on either side. Why is that? Be curious. Now you realize the clip is made to hold the pin on either side.
MKIs have the pin on the right side. MKIIs the left.
Reassemble the clip with the pin on the right side. You now have a 10 shot MK I clip. Or alternatively spend lots more of your hard earned money and get a MkI clip. But why would you do that now that I told you how to do this?