I have the round reservoir also used on older Monster/916/748 etc. Not sure if that is Goldline.
I would like to see if your lever is the same. PM sent.
some goldline masters use the larger hollow pivot some have a smaller pivot and it's obvous which one is which (as one is not hollow) I just put goldlines from a 916 on my 620 to replace the coffins and the levers are the same as I crossed over my crg's. One of the best mods I've done yet. I don't know when they switched but by looking at a photo you should be able to tell what will work and what will not.