I love P90's tone. Who doesn't?

However the guitars i like rarely come with P90s in them, thus this dilemma.

Do they make P90s in like a humbucker shape/case or do they make a case that you can put over a previous humbucker case and just throw the p90s in?

And is there any kinds other then the gibson kind (im not familiar with their tone but ya know just incase i would prefer a different tone.)
What he said^^

Also another option is the mighty Seymour Duncan P-Rail.
They make a high output version too. High on my shopping list.

Gilchrist custom
Yamaha SBG500
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100

Cathbard Amplification
My band
Bareknuckles Mississippi Queen, Manhatten, Stockholm
Lollar Single coil for Humbucker
If your on a tight budget GFS mean 90/Dream 90
2002 PRS CE22
2013 G&L ASAT Deluxe
2009 Epiphone G-400 (SH-4)
Marshall JCM2000 DSL100
Krank 1980 Jr 20watt
Krank Rev 4x12 (eminence V12)
GFS Greenie/Digitech Bad Monkey
Morley Bad Horsie 2
MXR Smart Gate
Bareknuckle Mississipi Queens
Seymour Duncan Phat Cat

Those would be the first two I'd look at (The BKPs are awesome but far from cheap)
Guitars & Gear:
Parker Nitefly M
Sumer Metal Driver
Ibanez RGD2120Z
Two Notes Torpedo CAB