You have asked a 'loaded question'.

First, member LRF is absolutely right. Your question is near meaningless and quite impossible to answer as presented. We need more information.

(Note to self; stop falling asleep during William Powell movies.)

Second, regardless of what model your MS, to mount a scope on a Mannlicher Schoenauer is far more involved than to simply locate 'rings'.

Identify your Mannlicher Schoenauer

The front receiver ring is the first place to look.

The receiver above is an M1910 (9.5X57) manufactured between 1924 and 1938.

The above stamp on left side rail was changed in 1926 to 'Steyr - Werke AG'.

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For the issue of 'scoping' an MS, let's start with the basics:

If your receiver ring is stamped M1900, don't mess with it. They were essentially pre production prototypes - sales samples and are quite valuable.

If stamped Y1903 or Y1903/14 with a large crest above, it's a 'Greek contract' military MS - many have been 'sporterized'.

The early MS sporting arms had model numbers which corresponded to their MS proprietary chamberings. M1903 was 6.5X54 (as were the 'Greeks' and M1900), M1905 was 9X56, M1908 - 8X56, and M1910 was 9.5X57 (.375 Nitro Express Rimless to the Brits). The M1924 'Sequoia' was built on a new and longer receiver for the 'U.S. Cartridge of 1906' (.30-'06).

With the new receiver, Steyr included more chamberings and abandoned the model numbering system. From 1925 and through WW2 they would be marked with their 'kalibre' rather than model no.

If your receiver is stamped 'Made in Germany', don't mess with it. There weren't many sporting arms made during the 'Anschluss' (Nazi occupation of Austria), and those have added value.

For any of the above models and through the M1950, to add a side mount scope requires that a flat area be machined to the left side of the receiver in precise alignment.

The M1950 saw a return to model numbers, but things get odd later.

If you disassemble your MS, use proper fitting (thin) drivers.

The early MS are difficult and expensive to 'scope'. They (pre WW2) models often employed claw mounts or the pinch mount known as a 'Vienna Snapper'. These superb systems allowed simple, one handed, removal / reattachment with instant return to zero and were mounted to not obstruct the iron sights when attached.

Mauser with claw mount:

Claw Mount (on MS):

Mannlicher Schoenauer with 'Vienna Snapper':

Vienna Snapper:

It was during the 1950s that Steyr provided a precisely machined area in just the right place for side mounts with a cover plate installed for those who wished to remain scopeless:

Even so, those mounts are some chunky monkeys. For a cleaner option of the 1950s, Steyr offered a new swing away mount of their own:

All of this is but 'tip of the iceberg'. If you can provide clear photos (or at least very detailed and accurate description) of your MS we can identify the model. Once the model is identified we can likely steer you in a proper direction.

Be aware, however, that MS scope installation by any means except, perhaps, the later model side mounts, must be performed by a master craftsman that has specific experience scoping Mannlicher Schoenauers.

Also be aware that 'uncut' MS often trade at a premium.

William Powell: https://www.youtube.com/watch?v=QlAk9O7n6s4