Might want to double check to make sure the buttstock hasn't been cut flat for a recoil pad before spending the $$ on a buttplate. The end of the buttstock should be curved and either the serial number or a group of 4 or so letters/numbers should be visible.
“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