This is a metric GM brake caliper. These are called "big bore" calipers because they have been re-designed with a larger piston increasing the stopping power by 20%. These are used on hot rods and custom cars or as an upgrade on 1978-88 on mid-size GM cars or on the S10 pickup which is where the original design came from. These will work on any application where same metric GM calipers are used. These fit either right or left side simply by swapping the bleeder screw and banjo fitting. The pair in the URL are bare metal like yours but some are available powder coated in different colors.

This is a metric GM brake caliper. These are called "big bore" calipers because they have been re-designed with a larger piston increasing the stopping power by 20%. These are used on hot rods and custom cars or as an upgrade on 1978-88 on mid-size GM cars or on the S10 pickup which is where the original design came from. These will work on any application where same metric GM calipers are used. These fit either right or left side simply by swapping the bleeder screw and banjo fitting. The pair in the URL are bare metal like yours but some are available powder coated in different colors.

References:

https://www.ebay.com/itm/GM-METRIC-CAMARO-S-10-BIG-BORE-CALIPERS-1974-75-76-7...