porthole windows for a Balboa 24

[Blessed]

I was given a Balboa 24 and am in need of new porthole windows and am having trouble finding the right size on the internet; does anyone have any advice?
there are 4 bigger ones and 2 small ones.

 

[dlochner]

Welcome to SBO.

Photos and measurements would be very helpful.

 

[Dave Groshong]

They are likely Gray Enterprise or Beckson brand, look for a stamp on the inside frame:

Gray Enterprises Ports and Parts

Gray Enterprises Ports and Parts

shop.sailboatowners.com

 

[Blessed]

thank you.
I did a rough measurement of the bigger ones; 21 1/4"? x 7"??? ; and the smaller ones: 11"? x 4 1/2"??