Valve Stem Seals Triple T595

Just realised I’m going to need 12 valve stem oil seals!
Triumph original around £12 each (ouch)...other options on eBay £3 each, as pictured below!
Any experiences with non-original seals welcome, but...and here’s the question:

In the Haynes Manual is says ‘note, the seals are different sizes for the inlet and exhaust valves!’ However, WOT and Fowler’s and the eBay listing only appear to offer 1 size?

What’s the consensus out there?

 

Another question:
am I right in thinking the grease that gets put on the valve stems during the rebuild, is the only grease it ever sees?

 

The eBay seller has said the seals are to fit valves of 5.5mm

Not sure where that leaves me with the Haynes Manual reporting as below, and the parts diagram from WoT and Fowlers only showing 1 type of seal?

 

Does anyone know whether
“T3990067 | Gasket kit cylinder head” contains the 12 valve seals? I can’t seem to find the contents of it anywhere.

 

Blimey, that is SO kind, but I already went ahead and bought the grinding kit before Christmas, when I expected to be doing the job...but truly appreciate the sentiment all the same.
It’s the strangest thing, but I’ve willingly spent £140 on 5 Torx tools, yet really recoil at £150 for the seals for some reason. I’m even considering reusing the old ones, but can’t decide whether buying non-OEM seals is better than doing that...such a dilemma.
I hadn’t intended to buy the gasket kit, but if the kit contains the seals it would represent a saving...will check it out.
Many, many, thanks again!

 

That would definitely make sense, just odd that the Haynes manual draws attention to there being 2 sizes, albeit that they describe them wrongly when saying the inlets are slightly smaller? Very strange!

 

What would be your thoughts on reusing them, especially if the valves were all carefully deburred before pulling out?
It seems excessive to have a seal, that a valve ordinarily slides up and down in, defined as disposable when the valve is removed from it?
The bike has done 29k...I’m seriously toying with the idea of reusing them, what’s your own take on it? Perhaps 29k is a good time?

 

Really appreciate your time...many thanks for this.

 

Just to add, I’ve spoken to Fowlers who tried to find out for me without success themselves. Fowlers sell the valve stem seals for £8.75 (vat inc.) which is significantly cheaper than WoT (as are all their parts), but that’s still £105, which makes me think they wouldn’t be included in a head gasket kit that costs £168?
Having to wrestle with my financial conscience now!

 

@Tricky-Dicky and @dilligaf
Many thanks, gents...I’ve got a couple of emails out to other companies that offer the kit for sale, plus I’ve now found someone offering the entire set of seals for £30, so options are opening up.
I’m SO tempted to run with the old ones though...it must easily be possible to push the ‘lip’ up from inside by using a valve and giving it a good old inspection. Their service life must extend well beyond 29k, surely?

 

Just to answer this question for future enquirers:

“Thank you for your email and enquiry. We can confirm that the Gasket Kit Part T3990067 includes 12 x T3990004 Valve Stem, Seals.

Gasket Kit T3990067 is in stock and available to purchase through your local Triumph Approved Dealer.

Thank you for your continued support of the Triumph Brand and stay safe.

Kind regards,

Louise
Triumph GB”