W123, SVO/WVO parts

Hi,

I am again successfully confused by the website, so need to be unconfused once more:

On your website under the item "Heavy Duty Monark Ultimate Hand Primer Pump" I have read the following sentence: <...works great with SVO WVO fuels> therefore I bought the pump.

Then once I received it, the instruction booklet that came with it said: <...Its only disadvantage, it will not work well with bio-diesel and it may not work at all with waste vegetable oil SVO/WVO...>> but the problem, that is what I want to use with eventually.

While replacing my rear axle, I unbolted the shock from the top (per the instructions). Unfortunately, I just left the washer on there while I lowered the shock with a jack.
When I got the axle installed in the hub, and raised the shock back to its normal position, I heard a clunk and looked to realize that the large washer on top had fallen off. I have looked in there the best I could and can not seem to find it. I have a temporary solution on there currently which consists of two washers that are slightly smaller in diameter than the correct one. The substitute is only there so that the whole assembly doesn't fall down, and I would like to get a correct one on there as soon as possible. Preferably before I start driving it again. (it's parked right now while I fix a few major items)