AHD may have a little logistic issue with this.
Not all aircraft with IBF's are fitted with the "fixed parts" to allow removal of the filters and fit the blanking plates.
It is listed in the SB to retrofit the IBF's with the covers as an "optional part" and listed in the IPC but there was no facility to install it. i.e. Service Bulletin.
They have just released an SB as of today the 9th of December but no listing of the kit price. Why it isn't part of the original IBF kit is beyond me. It is offered as a "product improvement" which is a euphemism for "oops" to "save face" or "Gesicht wahren" maybe depending on where you are standing at the time.
As a spare part the list price is EUR 6775.14 per side with a lead time of 7 months! Some serious margin there in the "cost recovery" and so much for this winter then?
Looks like a flat piece of Alclad and an Alclad frame, 26 odd screws and corresponding bunch of nutplates. My guess is the total material cost might be EUR 200.00 max and I think I could make them myself in about 4 hours!
The SB says it takes about 10 hours to complete the installation.
At the time we purchased an H145 it was not offered or listed and operationally if you have an issue with a filter you would be grounded without having the option to remove the filter and continue operating.
No doubt the filters are well worth it for the added protection to the operation of the engines but I feel that someone has not really thought this through on the operational side at AHD.
Personally I think the kit should be included as part of the original IBF install SB as it would make sense to incorporate it at the time of installation and the retrofit offered as a "commercial incentive" i.e. FOC.
Just spitballing as we do here but I think a few folks may have a case.