As much as I like, admire and support Larry Potterfield, this is where the local gun shop shines. Take your rifle with you to the shop and pick and choose the ones that work. Any shop worthy of your business will work with you on this until you have the set up you need.
The other option is to sit down at your computer and start ordering parts. However, be prepared to start building a drawer of rings and rails that rivals you "box-o-holsters."