I'd call Talley directly. They'll not only tell you which bases fit your rifle but also which height ones you need for the scope your using. GREAT people to deal with.
http://www.talleymanufacturing.com/cgi-bin/public_controller.cgi?view=contact I just got this from Marlin's web site. It's a scope base chart:
Models XL7, XS7
Manufacturer Finish/Style Front Base Rear Base One Piece
B-Square 15510 (XL7)
IronSighter Blue 46 47 IRL-70LA (XL7)
Leupold Blue 50020 (Front and Rear Set) 50000
Millett WB70003 (Front and Rear Set)
Talley Blue-Lightweight 94X702 (Front and Rear Set)
Silver-Lightweight S94X702 (Front and Rear Set)
Warne Blue M904 M905
Weaver Blue 402 47 49718 (Steel)
Silver 402S 47S
Marlin G4771310-01
Also found this:
http://www.dnzproducts.com/index.php?main_page=product_info&cPath=66_79&products_id=550 This is the part# from Marlin's site on the Talley site:
94X702 1" Model 70 (.860) Standard Caliber and Short Mag Extended (Med) F .500 R .625 BA $43.95
