I tried getting an A2 tailcap and/or boot from them a month or two ago. No dice, depleted stock. The gentleman I spoke with was kind enough to give me a generous discount code to use on a future purchase, which was unexpected and appreciated.
Guess SF ran out of most old model resources since this year...?
Last time I requested the A2 tailcap replacement was around late last September (early October) and the request was fulfilled within a week. But that tailcap is for my friend who suffered from one stuck in low mode.
And NO, you cannot just request for boot replacements but the entire tailcap assys instead. I had a similar encounter with my first Z58 some 10 years ago when the boot wore out and I was instead offered a new Z58 replacement that features newer internals, which I could not accept. In the end I chose to keep the old Z58 with the worn-out boot (which was since substituted with a different one for a different switch application inside the said host).
Meanwhile, discount code is generally appreciated, but that means you're to do a brand new purchase that serves no justice to your old light (esp. any A2 in need of service). Like I said before, the only alternative would be to browse thru eBay for used Z62s, and some even come without a rubber boot and retainer ring. Luckily substitute (third party) boot replacements will be available in a few months, while dedicated retainer tail shrouds are already available.