I put the spring on the belt buckle holder/clip THEN installed the holder and door... I think the "nuts" on the ashtray door are just pressed on. So, they should slide off. I forget if I did the same trick with that door - installing with spring already attached. Though, I thought that this spring kind of just lies in a grove.?.? No, I recall drilling out an aftermarket console to mount those...
Since I will be repainting mine soon, I'll be doing it all over again. Hope I remember how I did it! ;-)