sprocket

Hey fighters, I need a bit of help from the CF gurus regarding a sprocket compatibility. I have a wheel swap on my bike and the standard sprocket for these wheels is too big number of teeth-wise. I'm looking for a sprocket with the following specs as seen in the photo BUT with 40-41-42 teeth...

Ive done a SSSA conversion for my bike, the rear sprocket is to far out by roughly 5mm. I tried putting spacers to bring out my front sprocket but then the circlip doesn't fit on and im assuming it will fall out. Whats the other way i can bring the sprocket out to align without endangering...