They are either mis-labeled or they are the wrong seal altogether. Umbrella seals fit fairly loosely over the valve guide and seat on top of it as I and Randal have already mentioned. Your seal is getting smashed between the top of the guide and the bottom of the retainer because is has an interference fit on the guide itself and isn't seating fully on top of it. The seal should also fit inside of the valve spring with plenty of room to spare and not rub it. If it does, then either the springs are requiring the use of a smaller diameter seal such as a teflon style that requires the guide to be machined to install them(assuming the umbrella seal is the correct one and not mis-labeled), or there could have been a better choice of springs that allows the use of the stock umbrella seal to begin with.
I was just comparing the seals Tlowe referenced (the ebay Viton's) to the ones I have. I used a digital caliper to compare dimensions to the specs listed on ebay and mine are identical. Also, the inside diameter of 12bolt's damper spring is exactly the same as my stock springs.
If I push my seal so it fits over the guide (which I can fairly easily) it provides a snug fit on the guide and still grips the stem. However, with it over the guide the damper spring will not fit around it. There is not enough clearance between the damper spring and the guide to put the umbrella seals I used between without them touching/rubbing. The only difference between the Viton's and mine could be the thickness, but they *look* the same in the pictures.
It looks like I either need an umbrella that will ride up and down with the stem or to use the original o-rings with tin shroud under the retainer. The only thing that upsets me is switching back to the shroud/o-ring drastically affects my spring installed heights.
