Bergs asked the question, and the surprise would be that those gears are no good at all for the models listed in the title. The motor would not run, a mystery conundrum, and worse, possible valve and piston damage.
Like moths to a flame the words " Gold Star" and "RGS" draw out the bids, which is the only reason I can see for the escalating value. The truth is that the standard engine and more exotic variants share the same basic timing components, and there is no shortage of them at lower prices.
The clincher here is that with the exception of the fixed magneto gear, at least two of the cogs are for an A7 Longstoke, and if fitted to a later engine, timed by the marks, it won't run, if at all, and the poor punter will be scratching their head for weeks, entrust it to a specialist and open their wallet.
Anyone searching for Longstoke timing gears can get by by using the readily available shortstroke gears, marking them with the correct timing marks and in addition repositioning the breather drive peg in the cam gear. They are exactly the same, shaft and toothwise.
So, if you happen to have realised they are Longstroke Gears, you've bid a bit more than you needed to.
The Longstoke crankcase here has set a new record pricewise, despite needing remedial action, as has the curious 66mm A7 barrel. The rest of them (no tappet guide, raised spigot for cylinder head location) are 62 mm standard bore.
If you've bid on the RGS Cam, there's a good chance it won't fit, and the A7/A10 gear cluster and mainshaft are certainly not as described for application.
Just time to view the listings before they close, laugh, learn, count your blessings. (Or not)
Cheers.
Swarfy.