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I recently picked up my RB25, and after looking at the crazy high prices for transmission/engine mounts and reading some of the reviews I figured it wouldn't hurt to give it a go myself. If it works out, great, if not then I'll buck up and pay the money for the pre-fabbed ones. Anyways, I decided to start with the transmission mount as it seemed easier and It would hold my engine in place beter for the motor mounts. First things first, I took the old transmission mount off of the 4 speed transmission, and it bolts up perfectly to the 5speed RB tranny. I was pleasantly surprised! That meant I could at least use the original mount to an extent. Then, I put the engine in place to get measurements. I pushed it almost as far back as I could towards the firewall. I noticed that the mckinney mounts seemed to bolt the engines straight down, but it seemed like you'd have to modify the trans tunnel in order to have the shifter go through. I wanted my shifter to be in more of a stock location, and it wouldn't pop through until I pushed it farther back. Then, I crawled under and got some measurements. These probably aren't;t universal and probably won't work for everyone, but what I got was this: The original mounting area allowed the transmission mount to be 14 inches long. The new area I was mounting was 10". The original mounting holes were 12.25 inches apart in the middle of the holes, with the other hole being directly center. It was also farther back in the tunnel by 5". I figured the easiest way to do this would be to make some sort of jig, so I put together a crude assembly with just some shelf wood and some nails. I measured the above measurements, cut the ends off of the tranny mount 2" in each side, allowing it to fit in the new location. Then, I took some 1"x 2" bar I had lying around and just eyeballed it basically, holding it above and marking it with a pencil, then cutting it along the lines and shaving it as needed. I then tacked it in place, got under and double checked it and everything fit really well. Probably nto perfect, but it seems like it is pretty much perfect. I then pulled it back out and welded it all together. My welds are supreme, I know. I also cut a corner out of the passenger side tranny mount thing that I need to go in and weld up. The Speedo sensor, as many already know, doesn't fit in that area without that being modified. Also, a little plug for grinding masks. I bought this a few years back after cutting my lip off with this very grinder. I wised up and decided I wanted protection across my whole face. Yesterday, there mustve been some sort of manufacturing error with the disc I was using and it exploded while in use. The biggest chunk hit me right in the face, but thanks to this bad boy I'm all good. I'm curious everyone's thoughts! do you think this will old, assuming my professional quality welds penetrated well? Of does it need to be more centered across?