Hey Dennis, I'm glad your happy with them! Each one is handmade so there a lot of TLC goes into a set! lol What's the best "glass inserts for original U13" is a great question! My personal pick is actually finding original inserts but I know it's darned near impossible to track down now a days! I know I'm telling something you already know. But there is hope, I had a conversation with the owner of Bronco Design about having him produce inserts that closely matches to original ones as he could make. Unfortunately I don't know where he stands on the project. So, why dont you drop him a line and I'll also do a follow up too. If enough guys show interest I'm sure he'll start making sets for us. Thanks and I'll keep you posted, Jeff