Basically, none of the tuners keep these in stock, they get them (normally from Tegiwa) as and when they're required.
I’ve managed to speak to Ian @ Clockwise today.
He said that there is normally very little demand for FN2 baffles, last batch he made had several sitting in stock for two years or so. And they’re a slight pain to machine, meaning uses up quite lot of his time to machine, which is why he’s not made any recently. Where the Ep3 ones are a bit easier and have strong demand all the time.
He said he did make some for M2/buddy club at one stage, the ones on Funky power are actually out of stock and listed as in stock in error.
Clockwise will at some stage make some new FN2 baffles, but probably months away…...
The only alternatives seem to be the Toda/Spoon replacement sumps which are £550-650 and they’re 3-5 weeks to get delivered in the current lockdown backlog situation from Japan.
I’ve seen there was a Mugen one
https://www.cplracing.co.uk/products/mugen-baffled-sump-honda-civic-type-r-fn2-2007-to-2011 no retailer seem to have this listed for sale.
Obviously these are a lot more than I’d budgeted for c£190 for dropin + labour.
But it looks like, unless one comes up used, it’s going to be very difficult to source a baffle for an FN2 anytime soon, whichever route you take.
At least Clockwise confirmed that over filling the K20 will be fine at the Ring, even with track tyres in his opinion.
Just FYI for anyone reading this in the future, he said not to use the FD2 oil dipstick, but to keep the FN2 one, which would ensure that it’s always got enough oil. And he designed them, so I take his word for it.