Interesting Tug. I'm pretty sure it is not a mount off the xl4. I found some pics of them and the oil feed etc. is all different. Looking at the leads you just gave, and what the previous owner told me, I'm thinking Ripsaw may have made a run of castings for 3002 mounts, even though the site says they only recommend up to 066 Stihls and the 3002 mount is for the 088's and 881's. Dang, I don't really want to buy a 088 to power this thing. any Ripsaws out there that are otherwise headed for the recycle bin that might be interested in selling a standard Stihl mount off of it? From earlier posts, it looks like brand new mounts are cost prohibitive if you can even get them.
How much did I pay for it? Let's just say I paid more than I should have in proportion to my due diligence research before I bought it, but the family won't go hungry if it doesn't pan out.