Aluminum Magnesium Retainers Pro Sports Series Ferrea Aluminum Magnesium Retainers (& Springs) Ferrea's Pro Series Aluminum Magnesium Retainers are precision CNC machined from aerospace quality alloys, fully heat treated and finished to exact tolerances. These retainers are engineered for optimum strength and weight savings which is crucial to valve-train stability at High RPM.

Part #	Val Stem Size	Diam. (A)	Out Step Diam. (B)	Inn Step Diam. (C)	References	Retainers Price/Each	Buy Now	Springs Price/Each	Buy Now
BMW 3 Series (M50-M51-M52)
E10025	6mm	28.20mm	22.85mm	17.15mm	Double Spring 7 deg Pro	$8.50		S10049 $19.50
GM 2.2 Eco Tec
E10026	6mm	27.95mm	20.80mm	16.1mm	Double Spring 7 deg Pro	$8.50		S10057 $19.50
GM 5 Cyl L5
E10027	6mm	27.95mm	20.80mm	16.1mm	Double Spring 7 deg Pro	$8.50		S10058 $19.50
Honda Civic 1.6L - SOHC 16 valve (D16Z6-Y5-Y7-Y8) 1992-2000
E10019	5.5mm	21.60mm	-	15.35mm	Single Spring 7 deg pro	Discontinued	-	S10029 $19.50
Honda/Acura Retainers "7 deg"
E10017	5.5mm	28.10mm	22.20mm	15.77mm	Double Spring 7 deg Pro	$8.50		Honda Stock Spring	-
E10018	5.5mm	28.20mm	22.85mm	17.15mm	Double Spring 7 deg Pro	$8.50		S10028 $19.50
E10018	5.5mm	28.20mm	22.85mm	17.15mm	Double Spring 7 deg Pro	$8.50		S10070 $19.50
E10018	5.5mm	28.20mm	22.85mm	17.15mm	Double Spring 7 deg Pro	$8.50		S10104 $19.99
E10021	5.5mm	27.95mm	20.80mm	16.10mm	Double Spring 7 deg Pro	$8.50		S10035 $19.50
Mitsubishi 3000 GT 3.0L - DOHC 24 Valves (6G72-Turbo 6G72T) 1991-1998
E10023	6.5mm	29.17mm	-	17.15mm	Double Spring 6 deg Pro	$8.50		S10037 $19.50
Mitsubishi Eclipse GS-GST 2.0L - DOHC 16 Valve (4G63-4G63T) 1990-2000
E10024	6.5mm	29.17mm	-	17.15mm	Double Spring 6 deg Pro	$8.50		S10036 $19.50
Saturn LLO 1.9L 1991-1998
E10028	5.5mm	28.20mm	22.85mm	17.15mm	Double Spring 7 deg Pro	$8.50		S10060 $19.50
Toyota MR2 2.0L "6 deg"
E10022	6mm	26.92mm	-	16.10mm	Double Spring 6 deg Pro	DISCONTINUED		S10034 $19.50
Toyota Supra Retainers "6 deg"
E10020	6mm	26.92mm	-	16.10mm	Double Spring 6 deg Pro	$8.50		S10033 $19.50