Well.. the 1920's/1930's Savage 99's were never fitted with a sight hood. So if you were to try to fit one, it'd be a custom fitting. If your sight is set up for a sight hood, it's likely a replaced sight and you'll want to figure out the brand to find a hood.
And no other buttplate will fit the buttstock of your rifle except for the crescent buttplate. The easiest solution is probably a slip on recoil pad, would make the buttstock a bit longer but no changes needed to the rifle. Don't leave the slip on pad on the rifle, most will cause the wood that's covered to age differently.
“
The Savage 99 Pocket Reference”.
All models and variations of 1895’s, 1899’s and 99’s covered.
Also dates, checkering, engraving.. Find at
www.savagelevers.com