Yeah, actually the front of the Goblin is a bit slouchy, plus I'm going to be adding quite a bit of weight up front soon with a bumper, winch and skidplate, so I'm leaving the front spacers full height. I don't know where I read that the front and rear bumpstops were different diameters, I think it was RRO.
My Isolator measures 4-1/4" outer diameter and 2-1/2" inner diameter and it came out of the rear spring cup...
I have one cut out, but it was a pain and is kinda ugly. It will work, but is not quite show quality
LOL!! I'm just using a jigsaw for the outer cut, then boring out the center on my drill press. I'll get some pics along the way...