LS1/S10 Rear Caliper Alternative

[BBPanel]

Doing LS1 rear discs on my 9" but I soon found out I had a clearance issue with the frame - tried a set of S10 brakes I have and now I have ~1/4" clearance. I will probably go with the S10 brakes and pocket the frame to get the clearance I need but was curious if there are any alternatives to either caliper that is narrower in width and will use the oem abutments? Bottom caliper is LS1, upper is S10. Thanks.

https://static1.pt-content.com/images/pt/2011/01/IMG_0166-1.jpg

[indyjps]

http://www.speedwaymotors.com/ProductSummary.aspx?free_text|1/15/2011%209:06:25%20AM=calipers&deptId=0&attribute_value_string%7cMake=GM

GM Metric calipers, lots of parts and support, used on circle track cars all over on for 9", Wilwood makes a set if you dont want the GM version. this link also has the emergency brake version and brackets