[Advanced Design]

It uses design elements of the C7 water pump. So, if a water pump goes bad, you will need one from Holley is how I interpret the information they provided.

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HOLLEY MID-MOUNT COMPLETE ACCESSORY SYSTEM
LS Engine Drive includes SD7 A/C Compressor, Alternator, P/S Pump, Tensioner, Belt, & Pulleys
PART# 20-185
$1,999.95 Suggested Retail
$1,799.95 Your Price
Estimated shipping date: 01/22/2018
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Starting at $159 a month with Learn More

Fits ALL LS engines except with dry sump and/or supercharger. Original belt alignment is not a variable as the water pump and crank pulley are included.
OVERVIEWSPECSTECH RESOURCES
Holley’s Mid-Mount complete accessory system has all accessories pulled in tighter than other accessory drives. At the heart of the system is a “bracketless” design (Patent Pending), where the accessories bolt directly to the water pump for a clean, integrated form. The design offers superb engine visibility to show off your horsepower, not your accessories. Among the many swap friendly features are bottom heater outlets for clearance in tight applications. The Holley designed alternator is just as innovative. This premium alternator utilizes hairpin/square wire, 6-phase technology as found on the C7 Corvette. The water pump also shares its design efficiencies with that of the C7 Corvette. The compact and reliable SD7 A/C compressor and Type II P/S pump with baffled reservoir are also integrated. The Mid-Mount drive completes Holley’s trilogy of accessory solutions giving a third option compared to the High and Low-Mount previously released. All three accessory solutions are for LS engines. When we say “complete”, we mean complete. The Mid-Mount system comes with everything you need. All accessories are included; the water pump, A/C compressor, Alternator, P/S pump with reservoir, and the crank damper. All pulleys and the belt are supplied. Even heater hose adapters, power steering to -6 AN hardline, and the alternator plug/harness are included. Easy assembly was a priority during the entire development of this accessory solution. Color graphical instructions walk you through every step of the ultra-easy installation.
Features:
Bracketless accessory mounting with ultra-easy assembly
Bottom outlet heater hose options for swap application clearance
LT1 style hairpin premium 150 amp alternator
LT1 style water pump cartidge design
Compact SD7 A/C compressor
Type II power steering pump with baffled reservoir
P/S adapter hardline to AN -6 adapter included
Steam tube input port
Shortened top outlet nipple for more radiator hose turns and routing room
OE pulley ratios for optimal accessory performance
No adapters/spacers required!
Fits ALL LS engines except with dry sump and/or supercharger. Original belt alignment is not a variable as the water pump and crank pulley are included.
Works with all common aftermarket and factory throttle bodies and intakes.
Works with VVT applications
Works with Hooker turbo manifolds.