Any good EER pistol scope will work. Finding one with a gloss finish might be a little difficult. It seems most manufacturers now go with the less costly matte black, or silver.
I have found a few used, in very good condition gloss finish scopes on ebay for several 'Tender barrels. I generally don't go to extreme measures to match things up though. I have a stainless G2 frame that I use stainless barrels, abd scopes, gloss barrels and scopes, and recently a matte black cerakoted barrel with a matte scope.
Congratulations on your 'Tender. But one warning, you have just begun. Contender barrels are like potato chips. You can't have just one.
I bought mine used with a 35 Remington Super 14, and a 14" 22 LR Match barrel. Since then I have added a 22 Hornet Super 14, 223 Super 14, 7-30 Waters Super 14, 10" 30 Harrett, and 10" SSK 45-70.
One other thing that really brings out the best in a Contender....Handloaded ammo. You can really develop, and tune your loads for the particular barrel length you are using.