Rich we have dropped the BMC brand recently and only will be offering DNA filters from hear on. As a special rate for a returning customer your price delivered: £45.62 If interested then let me know i will send you a discount voucher code.
Have to admit I was talking of 999 filters which sit at the end of air tubes/runners where they enter the air box. They can be cleaned, re-oiled and re-used but they're none too robust... My SS had a big paper air-cleaner with an enormous surface area. It couldn't be re-used but that didn't matter because you could use Porsche/Audi ones which are cheap as chips...
BMC are great, except the price. I've used JHP and pipercross over the bell mouth types too and the latter is best of the two. I like the protection they give as even if the tank comes off nothing can get ingested by the motor. But I'm told they rob a bit of power, and have been known to catch fire if the engine spits back through the throttle bodies. Pays your money, take your chances.