bulkhead size

[fishstix]

So I want to replace two old bulkhead they are for one inch Pvc. I ordered abs bulkheads, they fit hole tight, but they are really pushing in the sides of the overflow box. The old ones are the same fit, but the plastic ring is smaller. This is the ring that the gasket is on. Do the make smaller rings or is it ok for the bulkhead ring to fit really tight?