IMO, the best place to order DIP products is :
https://kinneysshootingsupply.com/
There is also J&P dovetail to Weaver delrin adapters :
https://www.jnpgunsprings.com/#!/CZ-RIMFIRE-PARTS/c/20995123/offset=0&sort=normal
You need to use them with Burris rings.
Personally, I use J&P adapters with High Burris Signature Zee Rings on my 452 Varmint.
I have good clearance with AO 40mm to 42mm ( maybe enough clearance for 44mm ) objective scope.
I also added a couple MOA cant with the offset inserts.
I used the DIP rail on other rifles and its also a very nice product. You can order one for 11mm or 3/8 dovetail, RH or LH, with 0 or 25 MOA and extended or not.