4-string soapbar P2-sized pickups? Do they exist (apart from Bartolini)?

[growse]

I'm doing a refurb on an old Ibanez SR500, and I've just taken the Bartolini Mk1s out. My original plan was to replace them with something from Nordstrand (like a bigrig), but double-checking the dimensions, something seems off.

All the Nordstrand 4-string soapbars seem to either come in EMG35 (don't care), or "Bartolini BC" size (32mm x 101mm). However, measuring my Mk1's, they seem to be 32mm by 108mm(!). Some more research suggests this is the "Bartolini P2" size.

There's lots of pickups that come in P2 size. Problem is, they're all 5-string. Most 4-string seem to come in the shorter "BC" size.

Am I stuck? Does anyone (apart from Bartolini) make a good pickup in this size? Does it matter and can I just shim a BC size pickup in place (sounds complicated)?