@Varty Yo, I just used SOR heater restoration kit yesterday to freshen up my heater while I replaced a leaky heater core. I bought the RHD kit as I'm working on a 75' RHD 45. I used Shane's kit on my 78' 40 a couple years ago and I can say that there were a couple difference between the 2 kits.
-SOR was a bit more expensive.
-There were no directions with the SOR kit while Shane's had directions. It is pretty obvious where everything goes except I have a lot of left over plastic washers and some little lock washers that make no sense as to where they go as there were no plastic washers or lock washers on the original heater box. There were a couple things I knew to do as this is my second heater rebuild but if it had been my first directions would have been very nice. Case in point I wouldn't have known to use 3M adhesive to adhere the new foam to all the panels. Small gripe but for me it's the little things that matter.
-Shane's kit came with the internal spring, SOR's did not and it looks like they are charging an arm and a leg for just the spring....glad mine had enough life left in it to reuse...
-Shane's kit had exact matches for all the little plastic bits that fit on the control arms. SOR's kit definitely did not. I reused a couple plastic spacers that fit directly in the attachment sites on the control arms as the SOR kit did not come with exact matches (maybe these original plastic bits are unable to be sourced?? Maybe it's cause it's RHD??) Regardless, this is where directions to point this out would have been nice.
Lastly, and this is what really pissed me off about the SOR kit was that the metal washer that you push on to the main control lever (kind of has fingers on it so it can only be removed by ruining it) to lock everything in place in the SOR kit was thin cheap garbage that I destroyed trying to push it on with a socket as per Shane's instructions that came with his kit. Perhaps I should have used a different technique to install that "washer" (I don't know what else to call it) but as there were no instructions provided I wouldn't know. I'll try and snap a picture of what I'm talking about later. Regardless now I have to source a replacement for the ruined one, uhgggg.
Sounds like a lot of griping but I'm just trying to right a review more or less describing my experiences. Would I buy the SOR kit again? Yes as it has everything you need without having to run all over the place sourcing things. Would I be much more careful installing that final "finger lock washer?" Yes. Did the SOR RHD kit for 75' have exact matches for all the original bits and pieces on the heater box?, No....but I'd still buy it again.
There is my 2cents...