Try calling Les Hovencamp of Diamond Gunsmithing, Ithaca, NY at 607-273-4510 or contacting him through his website at www.diamondgunsmithing.com.
its been a while i contacted them but you can always reach them through the website..
I have what I believe is same, or as close to original Raybar for your Ithaca. PM me on here for cell phone, and I can text you a picture of it. If you think it might work, you can have it. Thanks, Rob