We were discussing scuppers on the CP-16 forum and I was referred to Boaters World for the parts. Fortunately they had 2 in stock, that is all I needed on our 1987. The original part I took off was from Atwood, and the new one purchased was from SeaDog Line out of Everett. Washington. It appears to match the old on perfectly, however I won't be mounting them until the weather warms so I can use just a bit of 3M5200 sealant. For those who need replacement, outside diameter is 2 3/4" and inside diameter is 1 3/4". it is part number 520500-1 , they were $4.99 each plus local tax. I want to thank everyone for pointing me in the right direction on this............ Doug